diff --git a/osm_ee/frontend.proto b/osm_ee/frontend.proto
index 36d01585fb36e9b588ce7380e81fefdec245ca48..667a5f7577b52071acbc30b787e72713b272c7a9 100644
--- a/osm_ee/frontend.proto
+++ b/osm_ee/frontend.proto
@@ -1,3 +1,21 @@
+/*
+#######################################################################################
+# Copyright ETSI Contributors and Others.
+#
+# 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.
+#######################################################################################
+*/
 syntax = "proto3";
 
 option java_multiple_files = true;