diff --git a/rill-flow-service/src/main/java/com/weibo/rill/flow/service/util/DAGDescriptorUtil.java b/rill-flow-service/src/main/java/com/weibo/rill/flow/service/util/DAGDescriptorUtil.java
index ba0b4f99..1c1fc144 100644
--- a/rill-flow-service/src/main/java/com/weibo/rill/flow/service/util/DAGDescriptorUtil.java
+++ b/rill-flow-service/src/main/java/com/weibo/rill/flow/service/util/DAGDescriptorUtil.java
@@ -1,3 +1,19 @@
+/*
+ *  Copyright 2021-2023 Weibo, Inc.
+ *
+ *    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.
+ */
+
 package com.weibo.rill.flow.service.util;
 
 import com.google.common.collect.Lists;