diff --git a/library/SGsAP_Templates.ttcn b/library/SGsAP_Templates.ttcn
index 428924f..4414dd1 100644
--- a/library/SGsAP_Templates.ttcn
+++ b/library/SGsAP_Templates.ttcn
@@ -6,6 +6,8 @@
  *
  * Released under the terms of the GNU General Public License, Version 2 or
  * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 import from SGsAP_Types all;