diff --git a/src/gsm/gsm_04_08_gprs.c b/src/gsm/gsm_04_08_gprs.c
index 43da27e..608fa8c 100644
--- a/src/gsm/gsm_04_08_gprs.c
+++ b/src/gsm/gsm_04_08_gprs.c
@@ -2,10 +2,12 @@
 /*
  * (C) 2009-2016 by Harald Welte <laforge@gnumonks.org>
  * (C) 2010      by On-Waves
- * (C) 2014-2015 by Sysmocom s.f.m.c. GmbH
+ * (C) 2014-2015 by sysmocom - s.f.m.c. GmbH
  *
  * All Rights Reserved
  *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or