--- a/compat.py	Wed Dec 22 22:30:05 2010 +0200
+++ b/compat.py	Sun Dec 26 20:36:59 2010 +0200
@@ -25,6 +25,19 @@
 #   with Python 2 and not usable conditionally via exec() and such
 #   because it is a detail of the syntax of the class statement itself.
 
+# Some code was adapted from Python 2.7.1 and its documentation.
+# This code is clearly marked as such in preceding comments and is
+# covered by copyright as follows:
+#
+# Copyright (c) 2001-2010 Python Software Foundation; all rights reserved.
+#
+# The code is used according to the PSF License Agreement
+# for Python 2.7.1, whose full text is available from your local
+# installation of Python (enter 'license()' in the interactive
+# interpreter) or from the Web at the following URL:
+#
+# http://docs.python.org/2.7.1/license.html#terms-and-conditions-for-accessing-or-otherwise-using-python
+
 try:
 	import builtins
 except ImportError: