diff --git a/comment_spell_check/comment_spell_check.py b/comment_spell_check/comment_spell_check.py
index 686b7e3..64b9a12 100755
--- a/comment_spell_check/comment_spell_check.py
+++ b/comment_spell_check/comment_spell_check.py
@@ -53,7 +53,9 @@
     ".cxx": "text/x-c++",
     ".c": "text/x-c++",
     ".hxx": "text/x-c++",
+    ".cs": "text/x-c++",
     ".py": "text/x-python",
+    ".R": "text/x-python",
     ".rb": "text/x-ruby",
     ".java": "text/x-java-source",
     ".txt": "text/plain",