--- a/medcouple.py
+++ b/medcouple.py
@@ -1,5 +1,25 @@
 #!/usr/bin/python
 
+# medcouple.py ---
+
+# Copyright  © 2015 Jordi Gutiérrez Hermoso <jordigh@octave.org>
+
+# Author: Jordi Gutiérrez Hermoso
+
+# 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 random
 
 from itertools import tee, izip