diff --git a/library/IuUP_Emulation.ttcn b/library/IuUP_Emulation.ttcn
index 752b897..56384ee 100644
--- a/library/IuUP_Emulation.ttcn
+++ b/library/IuUP_Emulation.ttcn
@@ -11,9 +11,10 @@
  *
  * 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
  */
 
-
 import from Osmocom_Types all;
 import from IuUP_Types all;