diff --git a/comment.py b/comment.py
index 46bf2ee..e237aaf 100755
--- a/comment.py
+++ b/comment.py
@@ -96,6 +96,6 @@ if __name__ == '__main__':
             except (KeyboardInterrupt, EOFError):
                 text = 'exit'
                 print(text)
-            if text == 'exit':
+            if text.lower() == 'exit':
                 break
             comment(text)