diff --git a/bsc-nat/BSC_MS_Simulation.ttcn b/bsc-nat/BSC_MS_Simulation.ttcn
index c45b5ac..ed6e92d 100644
--- a/bsc-nat/BSC_MS_Simulation.ttcn
+++ b/bsc-nat/BSC_MS_Simulation.ttcn
@@ -1,5 +1,15 @@
 module BSC_MS_Simulation {
 
+/* (C) 2017-2018 Harald Welte <laforge@gnumonks.org>
+ * (C) 2018 sysmocom - s.f.m.c. Gmbh; Author: Daniel Willmann
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
 import from IPL4asp_Types all;
 
 import from IPA_Emulation all;