diff --git a/bsc-nat/MGCP_Adapter.ttcn b/bsc-nat/MGCP_Adapter.ttcn
index 6491c68..478c688 100644
--- a/bsc-nat/MGCP_Adapter.ttcn
+++ b/bsc-nat/MGCP_Adapter.ttcn
@@ -1,5 +1,15 @@
 module MGCP_Adapter {
 
+/* MGCP Adapter for bsc-nat tests in TTCN-3
+ * (C) 2017 Harald Welte <laforge@gnumonks.org>
+ * 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 MGCP_Types all;