diff --git a/bigjoyints/big.py b/bigjoyints/big.py
old mode 100644
new mode 100755
index 2ce65e7..47109a8
--- a/bigjoyints/big.py
+++ b/bigjoyints/big.py
@@ -1,3 +1,23 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+#    Copyright © 2022 Simon Forman
+#
+#    This file is part of Thun
+#
+#    Thun is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    Thun is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with Thun.  If not see <http://www.gnu.org/licenses/>.
+#
 from copy import copy
 from random import randint
 from itertools import zip_longest