diff --git a/mercurial/mdiff.py b/mercurial/mdiff.py
--- a/mercurial/mdiff.py
+++ b/mercurial/mdiff.py
@@ -1,4 +1,10 @@
-#!/usr/bin/python
+# mdiff.py - diff and patch routines for mercurial
+#
+# Copyright 2005 Matt Mackall <mpm@selenic.com>
+#
+# This software may be used and distributed according to the terms
+# of the GNU General Public License, incorporated herein by reference.
+
 import difflib, struct, mmap
 from mercurial.mpatch import *