diff --git a/lib/tfw/yaml_fsm.py b/lib/tfw/yaml_fsm.py
index 63070d2..f454c22 100644
--- a/lib/tfw/yaml_fsm.py
+++ b/lib/tfw/yaml_fsm.py
@@ -1,3 +1,6 @@
+# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
+# All Rights Reserved. See LICENSE file for details.
+
 from subprocess import Popen, run
 from functools import partial, singledispatch
 from contextlib import suppress