Add a comment explaining -kb.
diff --git a/Lib/test/test_pep263.py b/Lib/test/test_pep263.py
index 48b8c13..3b09c12 100644
--- a/Lib/test/test_pep263.py
+++ b/Lib/test/test_pep263.py
@@ -1,4 +1,5 @@
 #! -*- coding: koi8-r -*-

+# This file is marked as binary in the CVS, to prevent MacCVS from recoding it.

 

 import unittest

 from test import test_support