diff --git a/library/MGCP_CodecPort.ttcn b/library/MGCP_CodecPort.ttcn
index c206986..d33afe1 100644
--- a/library/MGCP_CodecPort.ttcn
+++ b/library/MGCP_CodecPort.ttcn
@@ -5,10 +5,13 @@
  * which carry the decoded MGCP data types as payload.
  *
  * (C) 2017 by Harald Welte <laforge@gnumonks.org>
+ * contributions by sysmocom - s.f.m.c. GmbH
  * 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_PortType all;