diff --git a/library/MNCC_Types.ttcn b/library/MNCC_Types.ttcn
index f5028d2..828f341 100644
--- a/library/MNCC_Types.ttcn
+++ b/library/MNCC_Types.ttcn
@@ -1,3 +1,15 @@
+/* Osmocom MNCC type definitions in TTCN-3
+ * (C) 2017-2019 Harald Welte <laforge@gnumonks.org>
+ * contributions by sysmocom -s.f.m.c. GmbH
+ * (C) 2018 Vadim Yanitskiy <axilirator@gmail.com>
+ * 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 MNCC_Types {
 
 import from Osmocom_Types all;