diff --git a/Lib/test/test_pep263.py b/Lib/test/test_pep263.py
index 48b8c1310be..3b09c120d3b 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