diff --git a/scripts/chg-len.py b/scripts/chg-len.py
--- a/scripts/chg-len.py
+++ b/scripts/chg-len.py
@@ -1,4 +1,18 @@
 #! /usr/bin/env python
+#
+# This file is a part of LEMON, a generic C++ optimization library.
+#
+# Copyright (C) 2003-2009
+# Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+# (Egervary Research Group on Combinatorial Optimization, EGRES).
+#
+# Permission to use, modify and distribute this software is granted
+# provided that this copyright notice appears in all copies. For
+# precise terms see the accompanying LICENSE file.
+#
+# This software is provided "AS IS" with no warranty of any kind,
+# express or implied, and with no claim as to its suitability for any
+# purpose.
 
 import sys