diff --git a/library/Osmocom_VTY_Functions.ttcn b/library/Osmocom_VTY_Functions.ttcn
index fde05b3..b61a655 100644
--- a/library/Osmocom_VTY_Functions.ttcn
+++ b/library/Osmocom_VTY_Functions.ttcn
@@ -1,3 +1,14 @@
+/* Osmocom VTY interface functions in TTCN-3
+ * (C) 2017-2018 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
+ */
+
 module Osmocom_VTY_Functions {
 	import from TELNETasp_PortType all;
 	import from Osmocom_Types all;