diff --git a/.php_cs b/.php_cs
index 5983888..b4f320e 100644
--- a/.php_cs
+++ b/.php_cs
@@ -1,9 +1,18 @@
 <?php
+
+$fileHeaderComment = <<<COMMENT
+This file is part of the PHP Humanizer Library.
+
+For the full copyright and license information, please view the LICENSE
+file that was distributed with this source code.
+COMMENT;
+
 return PhpCsFixer\Config::create()
     ->setRules([
         '@PSR2' => true,
         'declare_strict_types' => true,
         'array_syntax' => ['syntax' => 'short'],
+        'header_comment' => ['header' => $fileHeaderComment, 'separate' => 'both'],
         'blank_line_after_opening_tag' => true,
         'single_blank_line_before_namespace' => true,
         'no_unused_imports' => true,
diff --git a/.travis.yml b/.travis.yml
index 162cdfb..dd1b745 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,6 +19,4 @@ install:
   - composer update
 
 script:
-  - ./bin/phpspec run --format=pretty
-  - ./bin/phpunit
-  - ./bin/php-cs-fixer fix -v --dry-run
\ No newline at end of file
+  - composer run test
\ No newline at end of file
diff --git a/README.md b/README.md
index 634292b..e808e1b 100644
--- a/README.md
+++ b/README.md
@@ -262,6 +262,33 @@ Currently we support following languages:
 * [Japanese](src/Coduo/PHPHumanizer/Resources/translations/difference.ja.yml)
 * [Romanian](src/Coduo/PHPHumanizer/Resources/translations/difference.ro.yml)
 
+# Development
+
+After downloading library update dependencies:
+
+```
+composer update
+```
+
+In order to check lowest possible versions of dependencies add 
+
+```
+composer update --prefer-lowest
+````
+
+Execute test suite:
+
+```
+composer run test
+```
+
+Run CS Fixer
+
+```
+composer run cs:php:fix
+```
+
+
 # Credits
 
 This lib was inspired by [Java Humanize Lib](https://github.com/mfornos/humanize) && [Rails Active Support](https://github.com/rails/rails/tree/master/activesupport/lib/active_support)
diff --git a/src/Coduo/PHPHumanizer/Collection/Formatter.php b/src/Coduo/PHPHumanizer/Collection/Formatter.php
index 60f51c4..ec28b4b 100644
--- a/src/Coduo/PHPHumanizer/Collection/Formatter.php
+++ b/src/Coduo/PHPHumanizer/Collection/Formatter.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Collection;
 
 use Symfony\Component\Translation\TranslatorInterface;
diff --git a/src/Coduo/PHPHumanizer/Collection/Oxford.php b/src/Coduo/PHPHumanizer/Collection/Oxford.php
index c102712..a27cf80 100644
--- a/src/Coduo/PHPHumanizer/Collection/Oxford.php
+++ b/src/Coduo/PHPHumanizer/Collection/Oxford.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Collection;
 
 final class Oxford
diff --git a/src/Coduo/PHPHumanizer/CollectionHumanizer.php b/src/Coduo/PHPHumanizer/CollectionHumanizer.php
index 2af7295..548cdc4 100644
--- a/src/Coduo/PHPHumanizer/CollectionHumanizer.php
+++ b/src/Coduo/PHPHumanizer/CollectionHumanizer.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer;
 
 use Coduo\PHPHumanizer\Collection\Formatter;
diff --git a/src/Coduo/PHPHumanizer/DateTime/Difference.php b/src/Coduo/PHPHumanizer/DateTime/Difference.php
index 8d7d213..60fce9a 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Difference.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Difference.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime;
 
 use Coduo\PHPHumanizer\DateTime\Unit\Day;
diff --git a/src/Coduo/PHPHumanizer/DateTime/Difference/CompoundResult.php b/src/Coduo/PHPHumanizer/DateTime/Difference/CompoundResult.php
index 4721c2e..7178ea1 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Difference/CompoundResult.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Difference/CompoundResult.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime\Difference;
 
 use Coduo\PHPHumanizer\DateTime\Unit;
diff --git a/src/Coduo/PHPHumanizer/DateTime/Formatter.php b/src/Coduo/PHPHumanizer/DateTime/Formatter.php
index f79d5fc..781fc3d 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Formatter.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Formatter.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime;
 
 use Symfony\Component\Translation\TranslatorInterface;
diff --git a/src/Coduo/PHPHumanizer/DateTime/PreciseDifference.php b/src/Coduo/PHPHumanizer/DateTime/PreciseDifference.php
index 221f1a6..75c1cfb 100644
--- a/src/Coduo/PHPHumanizer/DateTime/PreciseDifference.php
+++ b/src/Coduo/PHPHumanizer/DateTime/PreciseDifference.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime;
 
 use Coduo\PHPHumanizer\DateTime\Unit\Day;
diff --git a/src/Coduo/PHPHumanizer/DateTime/PreciseFormatter.php b/src/Coduo/PHPHumanizer/DateTime/PreciseFormatter.php
index 52a2e34..66800a1 100644
--- a/src/Coduo/PHPHumanizer/DateTime/PreciseFormatter.php
+++ b/src/Coduo/PHPHumanizer/DateTime/PreciseFormatter.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime;
 
 use Symfony\Component\Translation\TranslatorInterface;
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit.php b/src/Coduo/PHPHumanizer/DateTime/Unit.php
index bac4b47..2a3525f 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Unit.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime;
 
 interface Unit
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Day.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Day.php
index 0ab87a4..4e4f72d 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Unit/Day.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Day.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime\Unit;
 
 use Coduo\PHPHumanizer\DateTime\Unit;
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Hour.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Hour.php
index 7f75d91..8a21186 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Unit/Hour.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Hour.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime\Unit;
 
 use Coduo\PHPHumanizer\DateTime\Unit;
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/JustNow.php b/src/Coduo/PHPHumanizer/DateTime/Unit/JustNow.php
index 0b682d7..ea1120a 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Unit/JustNow.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/JustNow.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime\Unit;
 
 use Coduo\PHPHumanizer\DateTime\Unit;
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Minute.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Minute.php
index a8d39b8..1c2c3c2 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Unit/Minute.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Minute.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime\Unit;
 
 use Coduo\PHPHumanizer\DateTime\Unit;
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Month.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Month.php
index f860e52..ae26e8f 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Unit/Month.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Month.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime\Unit;
 
 use Coduo\PHPHumanizer\DateTime\Unit;
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Second.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Second.php
index 94a9c0c..12f3e54 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Unit/Second.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Second.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime\Unit;
 
 use Coduo\PHPHumanizer\DateTime\Unit;
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Week.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Week.php
index 9cc987c..cd0ff1a 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Unit/Week.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Week.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime\Unit;
 
 use Coduo\PHPHumanizer\DateTime\Unit;
diff --git a/src/Coduo/PHPHumanizer/DateTime/Unit/Year.php b/src/Coduo/PHPHumanizer/DateTime/Unit/Year.php
index 49ae9bc..4dda1c9 100644
--- a/src/Coduo/PHPHumanizer/DateTime/Unit/Year.php
+++ b/src/Coduo/PHPHumanizer/DateTime/Unit/Year.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\DateTime\Unit;
 
 use Coduo\PHPHumanizer\DateTime\Unit;
diff --git a/src/Coduo/PHPHumanizer/DateTimeHumanizer.php b/src/Coduo/PHPHumanizer/DateTimeHumanizer.php
index bfdfbc3..44f7472 100644
--- a/src/Coduo/PHPHumanizer/DateTimeHumanizer.php
+++ b/src/Coduo/PHPHumanizer/DateTimeHumanizer.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer;
 
 use Coduo\PHPHumanizer\DateTime\Difference;
diff --git a/src/Coduo/PHPHumanizer/Number/Ordinal.php b/src/Coduo/PHPHumanizer/Number/Ordinal.php
index 0c34ade..73e92a5 100644
--- a/src/Coduo/PHPHumanizer/Number/Ordinal.php
+++ b/src/Coduo/PHPHumanizer/Number/Ordinal.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Number;
 
 use Coduo\PHPHumanizer\Number\Ordinal\Builder;
diff --git a/src/Coduo/PHPHumanizer/Number/Ordinal/Builder.php b/src/Coduo/PHPHumanizer/Number/Ordinal/Builder.php
index 86a5b82..582055b 100644
--- a/src/Coduo/PHPHumanizer/Number/Ordinal/Builder.php
+++ b/src/Coduo/PHPHumanizer/Number/Ordinal/Builder.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Number\Ordinal;
 
 /**
diff --git a/src/Coduo/PHPHumanizer/Number/Ordinal/StrategyInterface.php b/src/Coduo/PHPHumanizer/Number/Ordinal/StrategyInterface.php
index f043910..aa23162 100644
--- a/src/Coduo/PHPHumanizer/Number/Ordinal/StrategyInterface.php
+++ b/src/Coduo/PHPHumanizer/Number/Ordinal/StrategyInterface.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Number\Ordinal;
 
 interface StrategyInterface
diff --git a/src/Coduo/PHPHumanizer/Number/RomanNumeral.php b/src/Coduo/PHPHumanizer/Number/RomanNumeral.php
index 0760fa2..745c60c 100644
--- a/src/Coduo/PHPHumanizer/Number/RomanNumeral.php
+++ b/src/Coduo/PHPHumanizer/Number/RomanNumeral.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Number;
 
 final class RomanNumeral
diff --git a/src/Coduo/PHPHumanizer/NumberHumanizer.php b/src/Coduo/PHPHumanizer/NumberHumanizer.php
index 25835ea..7d26299 100644
--- a/src/Coduo/PHPHumanizer/NumberHumanizer.php
+++ b/src/Coduo/PHPHumanizer/NumberHumanizer.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer;
 
 use Coduo\PHPHumanizer\Number\Ordinal;
diff --git a/src/Coduo/PHPHumanizer/Resources/Ordinal/DeStrategy.php b/src/Coduo/PHPHumanizer/Resources/Ordinal/DeStrategy.php
index 852d836..6a96127 100644
--- a/src/Coduo/PHPHumanizer/Resources/Ordinal/DeStrategy.php
+++ b/src/Coduo/PHPHumanizer/Resources/Ordinal/DeStrategy.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Resources\Ordinal;
 
 use Coduo\PHPHumanizer\Number\Ordinal\StrategyInterface;
diff --git a/src/Coduo/PHPHumanizer/Resources/Ordinal/EnStrategy.php b/src/Coduo/PHPHumanizer/Resources/Ordinal/EnStrategy.php
index 5ede85a..35e6f5a 100644
--- a/src/Coduo/PHPHumanizer/Resources/Ordinal/EnStrategy.php
+++ b/src/Coduo/PHPHumanizer/Resources/Ordinal/EnStrategy.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Resources\Ordinal;
 
 use Coduo\PHPHumanizer\Number\Ordinal\StrategyInterface;
diff --git a/src/Coduo/PHPHumanizer/Resources/Ordinal/EsStrategy.php b/src/Coduo/PHPHumanizer/Resources/Ordinal/EsStrategy.php
index 2031c63..30ba76e 100644
--- a/src/Coduo/PHPHumanizer/Resources/Ordinal/EsStrategy.php
+++ b/src/Coduo/PHPHumanizer/Resources/Ordinal/EsStrategy.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Resources\Ordinal;
 
 use Coduo\PHPHumanizer\Number\Ordinal\StrategyInterface;
diff --git a/src/Coduo/PHPHumanizer/Resources/Ordinal/FrStrategy.php b/src/Coduo/PHPHumanizer/Resources/Ordinal/FrStrategy.php
index 6125883..788789b 100644
--- a/src/Coduo/PHPHumanizer/Resources/Ordinal/FrStrategy.php
+++ b/src/Coduo/PHPHumanizer/Resources/Ordinal/FrStrategy.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Resources\Ordinal;
 
 use Coduo\PHPHumanizer\Number\Ordinal\StrategyInterface;
diff --git a/src/Coduo/PHPHumanizer/Resources/Ordinal/IdStrategy.php b/src/Coduo/PHPHumanizer/Resources/Ordinal/IdStrategy.php
index 7f86ebf..e678f99 100644
--- a/src/Coduo/PHPHumanizer/Resources/Ordinal/IdStrategy.php
+++ b/src/Coduo/PHPHumanizer/Resources/Ordinal/IdStrategy.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Resources\Ordinal;
 
 use Coduo\PHPHumanizer\Number\Ordinal\StrategyInterface;
diff --git a/src/Coduo/PHPHumanizer/Resources/Ordinal/ItStrategy.php b/src/Coduo/PHPHumanizer/Resources/Ordinal/ItStrategy.php
index 48bcfba..318bbf8 100644
--- a/src/Coduo/PHPHumanizer/Resources/Ordinal/ItStrategy.php
+++ b/src/Coduo/PHPHumanizer/Resources/Ordinal/ItStrategy.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Resources\Ordinal;
 
 use Coduo\PHPHumanizer\Number\Ordinal\StrategyInterface;
diff --git a/src/Coduo/PHPHumanizer/Resources/Ordinal/NlStrategy.php b/src/Coduo/PHPHumanizer/Resources/Ordinal/NlStrategy.php
index 37f8122..7350eb5 100644
--- a/src/Coduo/PHPHumanizer/Resources/Ordinal/NlStrategy.php
+++ b/src/Coduo/PHPHumanizer/Resources/Ordinal/NlStrategy.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Resources\Ordinal;
 
 use Coduo\PHPHumanizer\Number\Ordinal\StrategyInterface;
diff --git a/src/Coduo/PHPHumanizer/Resources/Ordinal/PtStrategy.php b/src/Coduo/PHPHumanizer/Resources/Ordinal/PtStrategy.php
index 4a47a59..2f625a8 100644
--- a/src/Coduo/PHPHumanizer/Resources/Ordinal/PtStrategy.php
+++ b/src/Coduo/PHPHumanizer/Resources/Ordinal/PtStrategy.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Resources\Ordinal;
 
 use Coduo\PHPHumanizer\Number\Ordinal\StrategyInterface;
diff --git a/src/Coduo/PHPHumanizer/String/BinarySuffix.php b/src/Coduo/PHPHumanizer/String/BinarySuffix.php
index cc42a60..b71e798 100644
--- a/src/Coduo/PHPHumanizer/String/BinarySuffix.php
+++ b/src/Coduo/PHPHumanizer/String/BinarySuffix.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\String;
 
 final class BinarySuffix
diff --git a/src/Coduo/PHPHumanizer/String/Breakpoint.php b/src/Coduo/PHPHumanizer/String/Breakpoint.php
index 911381b..e823511 100644
--- a/src/Coduo/PHPHumanizer/String/Breakpoint.php
+++ b/src/Coduo/PHPHumanizer/String/Breakpoint.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\String;
 
 interface Breakpoint
diff --git a/src/Coduo/PHPHumanizer/String/HtmlTruncate.php b/src/Coduo/PHPHumanizer/String/HtmlTruncate.php
index ccdfce3..f85097a 100644
--- a/src/Coduo/PHPHumanizer/String/HtmlTruncate.php
+++ b/src/Coduo/PHPHumanizer/String/HtmlTruncate.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\String;
 
 final class HtmlTruncate implements TruncateInterface
diff --git a/src/Coduo/PHPHumanizer/String/Humanize.php b/src/Coduo/PHPHumanizer/String/Humanize.php
index 92c27cd..a4ef053 100644
--- a/src/Coduo/PHPHumanizer/String/Humanize.php
+++ b/src/Coduo/PHPHumanizer/String/Humanize.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\String;
 
 final class Humanize
diff --git a/src/Coduo/PHPHumanizer/String/MetricSuffix.php b/src/Coduo/PHPHumanizer/String/MetricSuffix.php
index 46d4aec..3a76eb3 100644
--- a/src/Coduo/PHPHumanizer/String/MetricSuffix.php
+++ b/src/Coduo/PHPHumanizer/String/MetricSuffix.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\String;
 
 final class MetricSuffix
diff --git a/src/Coduo/PHPHumanizer/String/ShortcodeProcessor.php b/src/Coduo/PHPHumanizer/String/ShortcodeProcessor.php
index 22cbd69..405a056 100644
--- a/src/Coduo/PHPHumanizer/String/ShortcodeProcessor.php
+++ b/src/Coduo/PHPHumanizer/String/ShortcodeProcessor.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\String;
 
 use Thunder\Shortcode\HandlerContainer\HandlerContainer;
diff --git a/src/Coduo/PHPHumanizer/String/TextTruncate.php b/src/Coduo/PHPHumanizer/String/TextTruncate.php
index ebfddee..e48c044 100644
--- a/src/Coduo/PHPHumanizer/String/TextTruncate.php
+++ b/src/Coduo/PHPHumanizer/String/TextTruncate.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\String;
 
 final class TextTruncate implements TruncateInterface
diff --git a/src/Coduo/PHPHumanizer/String/TruncateInterface.php b/src/Coduo/PHPHumanizer/String/TruncateInterface.php
index 849b06b..1749047 100644
--- a/src/Coduo/PHPHumanizer/String/TruncateInterface.php
+++ b/src/Coduo/PHPHumanizer/String/TruncateInterface.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\String;
 
 interface TruncateInterface
diff --git a/src/Coduo/PHPHumanizer/String/WordBreakpoint.php b/src/Coduo/PHPHumanizer/String/WordBreakpoint.php
index 6489156..1a73722 100644
--- a/src/Coduo/PHPHumanizer/String/WordBreakpoint.php
+++ b/src/Coduo/PHPHumanizer/String/WordBreakpoint.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\String;
 
 final class WordBreakpoint implements Breakpoint
diff --git a/src/Coduo/PHPHumanizer/StringHumanizer.php b/src/Coduo/PHPHumanizer/StringHumanizer.php
index 5b02b2c..8da6660 100644
--- a/src/Coduo/PHPHumanizer/StringHumanizer.php
+++ b/src/Coduo/PHPHumanizer/StringHumanizer.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer;
 
 use Coduo\PHPHumanizer\String\Humanize;
diff --git a/src/Coduo/PHPHumanizer/Translator/Builder.php b/src/Coduo/PHPHumanizer/Translator/Builder.php
index 90a499a..b1500ff 100644
--- a/src/Coduo/PHPHumanizer/Translator/Builder.php
+++ b/src/Coduo/PHPHumanizer/Translator/Builder.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Translator;
 
 use Symfony\Component\Translation\Loader\YamlFileLoader;
diff --git a/tests/Coduo/PHPHumanizer/Tests/CollectionHumanizerTest.php b/tests/Coduo/PHPHumanizer/Tests/CollectionHumanizerTest.php
index c36703a..29933a9 100644
--- a/tests/Coduo/PHPHumanizer/Tests/CollectionHumanizerTest.php
+++ b/tests/Coduo/PHPHumanizer/Tests/CollectionHumanizerTest.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Tests;
 
 use Coduo\PHPHumanizer\CollectionHumanizer;
diff --git a/tests/Coduo/PHPHumanizer/Tests/DateTimeHumanizerTest.php b/tests/Coduo/PHPHumanizer/Tests/DateTimeHumanizerTest.php
index 628e3f6..efa9d95 100644
--- a/tests/Coduo/PHPHumanizer/Tests/DateTimeHumanizerTest.php
+++ b/tests/Coduo/PHPHumanizer/Tests/DateTimeHumanizerTest.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Tests;
 
 use Coduo\PHPHumanizer\DateTimeHumanizer;
diff --git a/tests/Coduo/PHPHumanizer/Tests/NumberHumanizerTest.php b/tests/Coduo/PHPHumanizer/Tests/NumberHumanizerTest.php
index 9eed3d9..ae40dbc 100644
--- a/tests/Coduo/PHPHumanizer/Tests/NumberHumanizerTest.php
+++ b/tests/Coduo/PHPHumanizer/Tests/NumberHumanizerTest.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Tests;
 
 use Coduo\PHPHumanizer\NumberHumanizer;
diff --git a/tests/Coduo/PHPHumanizer/Tests/StringHumanizerTest.php b/tests/Coduo/PHPHumanizer/Tests/StringHumanizerTest.php
index dcde823..c3f1f51 100644
--- a/tests/Coduo/PHPHumanizer/Tests/StringHumanizerTest.php
+++ b/tests/Coduo/PHPHumanizer/Tests/StringHumanizerTest.php
@@ -2,6 +2,13 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Coduo\PHPHumanizer\Tests;
 
 use Coduo\PHPHumanizer\StringHumanizer;
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index e800b9d..008bbfe 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -2,4 +2,11 @@
 
 declare(strict_types=1);
 
+/*
+ * This file is part of the PHP Humanizer Library.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 $loader = require_once __DIR__ . '/../vendor/autoload.php';