diff --git a/library/IPCP_Types.ttcn b/library/IPCP_Types.ttcn
index 75bb092..657289a 100644
--- a/library/IPCP_Types.ttcn
+++ b/library/IPCP_Types.ttcn
@@ -1,3 +1,13 @@
+/* IPCP (IP Configuration Protocol) in TTCN-3
+ * (C) 2017 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
+ */
+
 module IPCP_Types {
 
 import from Osmocom_Types all;