diff --git a/gui/fix-signals.c b/gui/fix-signals.c
index 37b7d7c..aaee731 100644
--- a/gui/fix-signals.c
+++ b/gui/fix-signals.c
@@ -1,3 +1,19 @@
+/* Copyright (C) 2013 Tom Tromey <tom@tromey.com>
+
+  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/>.
+*/
+
 #include <Python.h>
 #include <signal.h>