diff --git a/examples/dubbo/with-hystrix-go-client/app/example_fallback_filter.go b/examples/dubbo/with-hystrix-go-client/app/example_fallback_filter.go
index 748d91d6234cf774d429f0341e48b50dfeabd601..0e86988fd787e0df941b62ad038746b412baf314 100644
--- a/examples/dubbo/with-hystrix-go-client/app/example_fallback_filter.go
+++ b/examples/dubbo/with-hystrix-go-client/app/example_fallback_filter.go
@@ -1,12 +1,31 @@
+/*
+ * 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 main
 
+import (
+	"time"
+)
+
 import (
 	"github.com/apache/dubbo-go/common/extension"
 	"github.com/apache/dubbo-go/common/logger"
 	"github.com/apache/dubbo-go/filter"
 	"github.com/apache/dubbo-go/filter/impl"
 	"github.com/apache/dubbo-go/protocol"
-	"time"
 )
 
 const (