diff --git a/library/SCCP_Templates.ttcn b/library/SCCP_Templates.ttcn
index f4019b8..a5af073 100644
--- a/library/SCCP_Templates.ttcn
+++ b/library/SCCP_Templates.ttcn
@@ -3,6 +3,8 @@
  *
  * 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 SCCP_Templates {