diff --git a/java-commons/src/main/java/ru/progrm_jarvis/javacommons/annotation/DontOverrideEqualsAndHashCode.java b/java-commons/src/main/java/ru/progrm_jarvis/javacommons/annotation/DontOverrideEqualsAndHashCode.java
index c74e2f23..4c45e573 100644
--- a/java-commons/src/main/java/ru/progrm_jarvis/javacommons/annotation/DontOverrideEqualsAndHashCode.java
+++ b/java-commons/src/main/java/ru/progrm_jarvis/javacommons/annotation/DontOverrideEqualsAndHashCode.java
@@ -8,8 +8,7 @@
  */
 @Inherited
 @Documented
-@Retention(RetentionPolicy.CLASS)
-@Target(value = ElementType.TYPE)
+@Target(ElementType.TYPE)
 public @interface DontOverrideEqualsAndHashCode {
 
     /**
diff --git a/java-commons/src/main/java/ru/progrm_jarvis/javacommons/annotation/Internal.java b/java-commons/src/main/java/ru/progrm_jarvis/javacommons/annotation/Internal.java
new file mode 100644
index 00000000..b60979dd
--- /dev/null
+++ b/java-commons/src/main/java/ru/progrm_jarvis/javacommons/annotation/Internal.java
@@ -0,0 +1,19 @@
+package ru.progrm_jarvis.javacommons.annotation;
+
+import java.lang.annotation.*;
+
+/**
+ * Marker indicating that the annotated object is part of an internal API and so (in most cases)
+ * should not be used by the end-user of the API.
+ */
+@Inherited
+@Documented
+public @interface Internal {
+
+    /**
+     * Retrieves the reason why this API is internal.
+     *
+     * @return the reason why this API is internal
+     */
+    String value() default "";
+}