diff --git a/lib/xos-genx/xosgenx/checkers/syncstep.xchecker b/lib/xos-genx/xosgenx/checkers/syncstep.xchecker
index 836a2c2..c5f9c8f 100644
--- a/lib/xos-genx/xosgenx/checkers/syncstep.xchecker
+++ b/lib/xos-genx/xosgenx/checkers/syncstep.xchecker
@@ -1,3 +1,19 @@
+{#
+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#}
+
 {% for m in proto.messages %}
 {% if not m.options.no_sync %}
 {{ xproto_check_synchronizer(m) }}