diff --git a/library/Osmocom_CTRL_Types.ttcn b/library/Osmocom_CTRL_Types.ttcn
index 1d77668..eb22056 100644
--- a/library/Osmocom_CTRL_Types.ttcn
+++ b/library/Osmocom_CTRL_Types.ttcn
@@ -3,11 +3,13 @@
 /* Definition of abstract types for the CTRL protocol as used in Osmocom.
  * Uses the TITAN "TEXT" codec to auto-generate encoder/decoder functions.
  *
- * (C) 2017 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2017-2018 by 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
  */
 
 type charstring CtrlVerb ("GET", "SET") with {