diff --git a/comment.py b/comment.py
index 9a2025c..424339a 100755
--- a/comment.py
+++ b/comment.py
@@ -58,6 +58,7 @@ walker = ParseTreeWalker()
 
 
 def comment(text):
+    text = text.upper()
     input_stream = InputStream(text)
     lexer = CommentMacroLexer(input_stream)
     stream = CommonTokenStream(lexer)