diff --git a/rocketmq-example/src/main/resources/MessageFilterImpl.java b/rocketmq-example/src/main/resources/MessageFilterImpl.java
index ea6f3d8917eb9b3b787030b0a94e4bda1b02aa7c..2894a5582b912a46c0666efd9087fdc9b216eae5 100644
--- a/rocketmq-example/src/main/resources/MessageFilterImpl.java
+++ b/rocketmq-example/src/main/resources/MessageFilterImpl.java
@@ -1,3 +1,20 @@
+/**
+ * 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.
+ */
+
 package com.alibaba.rocketmq.example.filter;
 
 import com.alibaba.rocketmq.common.filter.MessageFilter;