diff --git a/AUTHORS.rst b/AUTHORS.rst
index 3f40894ca..268addf25 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -66,6 +66,8 @@ Contributors
 
 - Shun Sakai
 
+-  Dirk Brömmel
+
 Translators
 -----------
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 60fc8f647..e142f92f8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -44,6 +44,7 @@ CLI command and its behaviour. There are no guarantees of stability for the
 
 - More file types are recognised:
   - Julia (`.jl`) (#815)
+  - Modern Fortran (`.f90`) (#836)
 
 ### Changed
 
diff --git a/src/reuse/comment.py b/src/reuse/comment.py
index 863e39327..dc5ddbf5a 100644
--- a/src/reuse/comment.py
+++ b/src/reuse/comment.py
@@ -14,6 +14,7 @@
 # SPDX-FileCopyrightText: 2023 Kevin Meagher
 # SPDX-FileCopyrightText: 2023 Mathias Dannesbo <md@magenta.dk>
 # SPDX-FileCopyrightText: 2023 Shun Sakai <sorairolake@protonmail.ch>
+# SPDX-FileCopyrightText: 2023 Juelich Supercomputing Centre, Forschungszentrum Juelich GmbH
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -341,7 +342,7 @@ def comment_at_first_character(cls, text: str) -> str:
 
 
 class FortranCommentStyle(CommentStyle):
-    """Fortran comment style."""
+    """Fortran (fixed form) comment style."""
 
     SHORTHAND = "f"
 
@@ -349,6 +350,15 @@ class FortranCommentStyle(CommentStyle):
     INDENT_AFTER_SINGLE = " "
 
 
+class ModernFortranCommentStyle(CommentStyle):
+    """Fortran (free form) comment style."""
+
+    SHORTHAND = "f90"
+
+    SINGLE_LINE = "!"
+    INDENT_AFTER_SINGLE = " "
+
+
 class FtlCommentStyle(CommentStyle):
     """FreeMarker Template Language comment style."""
 
@@ -562,15 +572,18 @@ class XQueryCommentStyle(CommentStyle):
     ".ex": PythonCommentStyle,
     ".exs": PythonCommentStyle,
     ".f": FortranCommentStyle,
-    ".f03": FortranCommentStyle,
-    ".f90": FortranCommentStyle,
-    ".f95": FortranCommentStyle,
+    ".f03": ModernFortranCommentStyle,
+    ".f08": ModernFortranCommentStyle,
+    ".f90": ModernFortranCommentStyle,
+    ".f95": ModernFortranCommentStyle,
     ".fish": PythonCommentStyle,
     ".fnl": LispCommentStyle,
     ".fodp": UncommentableCommentStyle,
     ".fods": UncommentableCommentStyle,
     ".fodt": UncommentableCommentStyle,
     ".for": FortranCommentStyle,
+    ".ftn": FortranCommentStyle,
+    ".fpp": FortranCommentStyle,
     ".fs": CCommentStyle,
     ".ftl": FtlCommentStyle,
     ".gemspec": PythonCommentStyle,