diff --git a/diceware.py b/diceware.py
index 0a55276ccbd6eb256c68f01489e88303f170040a..27327816fb4f97afdc469250b5fd42812a129e0b 100644
--- a/diceware.py
+++ b/diceware.py
@@ -1,3 +1,18 @@
+#  diceware -- passphrases to remember
+#  Copyright (C) 2015  Uli Fouquet
+#
+#  This program 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.
+#
+#  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 import argparse
 import os
 import pkg_resources