diff --git a/msc/BSC_ConnectionHandler.ttcn b/msc/BSC_ConnectionHandler.ttcn
index f83407a..c1114a6 100644
--- a/msc/BSC_ConnectionHandler.ttcn
+++ b/msc/BSC_ConnectionHandler.ttcn
@@ -1,3 +1,15 @@
+/* BSC Connection Handler of MSC test suite in TTCN-3
+ * (C) 2018-2019 Harald Welte <laforge@gnumonks.org>
+ * (C) 2018-2019 sysmocom - s.f.m.c. GmbH
+ * (C) 2018 Vadim Yanitskiy <axilirator@gmail.com>
+ * 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 BSC_ConnectionHandler {
 
 import from General_Types all;
diff --git a/msc/MSC_Tests.ttcn b/msc/MSC_Tests.ttcn
index 0d6083e..16f7b9b 100644
--- a/msc/MSC_Tests.ttcn
+++ b/msc/MSC_Tests.ttcn
@@ -1,5 +1,17 @@
 module MSC_Tests {
 
+/* Osmocom MSC test suite in in TTCN-3
+ * (C) 2017-2019 Harald Welte <laforge@gnumonks.org>
+ * (C) 2018-2019 sysmocom - s.f.m.c. GmbH
+ * (C) 2018-2019 Vadim Yanitskiy <axilirator@gmail.com>
+ * 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
+ */
+
 friend module MSC_Tests_Iu;
 
 import from General_Types all;
diff --git a/msc/MSC_Tests_Iu.ttcn b/msc/MSC_Tests_Iu.ttcn
index 5798821..e592573 100644
--- a/msc/MSC_Tests_Iu.ttcn
+++ b/msc/MSC_Tests_Iu.ttcn
@@ -1,5 +1,15 @@
 module MSC_Tests_Iu {
 
+/* Osmocom MSC test suite for Iu interface in TTCN-3
+ * (C) 2019 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
+ */
+
 import from General_Types all;
 import from Osmocom_Types all;