diff --git a/TraceSegmentService.proto b/TraceSegmentService.proto
index 1c418b51b90026ce921097d17841a44196f6f6ee..e540dd7a4cd38f6fd6774d3d65c77419a3d678fc 100644
--- a/TraceSegmentService.proto
+++ b/TraceSegmentService.proto
@@ -1,3 +1,21 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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;