diff --git a/incubator/protobuf/services/nb/src/main/proto/mastership/MastershipServiceNb.proto b/incubator/protobuf/services/nb/src/main/proto/mastership/MastershipServiceNb.proto
index 6fc2705..4944d84 100644
--- a/incubator/protobuf/services/nb/src/main/proto/mastership/MastershipServiceNb.proto
+++ b/incubator/protobuf/services/nb/src/main/proto/mastership/MastershipServiceNb.proto
@@ -1,3 +1,18 @@
+/*
+ * 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.
+ */
 syntax="proto3";
 option java_package = "org.onosproject.grpc.nb.mastership";