diff --git a/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/ConfigEtcdExampleApplication.java b/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/ConfigEtcdExampleApplication.java
index 2445a9cf..ad793091 100644
--- a/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/ConfigEtcdExampleApplication.java
+++ b/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/ConfigEtcdExampleApplication.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 cn.hippo4j.example.config.etcd;
 
 import cn.hippo4j.core.enable.EnableDynamicThreadPool;
diff --git a/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/config/ThreadPoolConfig.java b/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/config/ThreadPoolConfig.java
index de3bb1de..5a57c743 100644
--- a/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/config/ThreadPoolConfig.java
+++ b/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/config/ThreadPoolConfig.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 cn.hippo4j.example.config.etcd.config;
 
 import java.util.concurrent.ThreadPoolExecutor;
diff --git a/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/controller/TestController.java b/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/controller/TestController.java
index f323a218..947bb610 100644
--- a/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/controller/TestController.java
+++ b/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/main/java/cn/hippo4j/example/config/etcd/controller/TestController.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 cn.hippo4j.example.config.etcd.controller;
 
 import java.util.concurrent.ThreadPoolExecutor;
diff --git a/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/test/java/Test.java b/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/test/java/Test.java
index 456642b3..455ec869 100644
--- a/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/test/java/Test.java
+++ b/hippo4j-example/hippo4j-config-etcd-spring-boot-starter-example/src/test/java/Test.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.
+ */
+
 import java.nio.charset.StandardCharsets;
 
 import io.etcd.jetcd.ByteSequence;