diff --git a/.licenserc.yaml b/.licenserc.yaml
index 0953675655..ea56bb6e15 100644
--- a/.licenserc.yaml
+++ b/.licenserc.yaml
@@ -89,6 +89,7 @@ header: # `header` section is configurations for source codes license header.
     - '**/META-INF/MANIFEST.MF'
     - '.repository/**'
     - '**/.flattened-pom.xml'
+    - 'hugegraph-core/src/main/java/org/apache/hugegraph/backend/id/SnowflakeIdGenerator.java'
     - '**/optimize/HugeScriptTraversal.java'
     - '**/type/Nameable.java'
     - '**/define/Cardinality.java'
diff --git a/LICENSE b/LICENSE
index 153270d9bb..6b036146f3 100644
--- a/LICENSE
+++ b/LICENSE
@@ -207,6 +207,7 @@ Apache 2.0 licenses
 The following components are provided under the Apache License. See project link for details.
 The text of each license is the standard Apache 2.0 license.
 
+hugegraph-core/src/main/java/org/apache/hugegraph/backend/id/SnowflakeIdGenerator.java from https://github.com/twitter-archive/snowflake
 hugegraph-core/src/main/java/org/apache/hugegraph/traversal/optimize/HugeScriptTraversal.java from https://github.com/apache/tinkerpop
 hugegraph-core/src/main/java/org/apache/hugegraph/type/Nameable.java from https://github.com/JanusGraph/janusgraph
 hugegraph-core/src/main/java/org/apache/hugegraph/type/define/Cardinality.java from https://github.com/JanusGraph/janusgraph
diff --git a/hugegraph-core/src/main/java/org/apache/hugegraph/backend/id/SnowflakeIdGenerator.java b/hugegraph-core/src/main/java/org/apache/hugegraph/backend/id/SnowflakeIdGenerator.java
index ba2780931b..0ac86353fc 100644
--- a/hugegraph-core/src/main/java/org/apache/hugegraph/backend/id/SnowflakeIdGenerator.java
+++ b/hugegraph-core/src/main/java/org/apache/hugegraph/backend/id/SnowflakeIdGenerator.java
@@ -1,18 +1,14 @@
 /*
- * 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.
+ * Copyright 2010-2012 Twitter, 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.
+ *      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 org.apache.hugegraph.backend.id;
@@ -94,18 +90,6 @@ public Id generate(HugeVertex vertex) {
         return this.generate();
     }
 
-    /*
-     * Copyright 2010-2012 Twitter, 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.
-     */
     private static class IdWorker {
 
         private final long workerId;
diff --git a/hugegraph-dist/release-docs/LICENSE b/hugegraph-dist/release-docs/LICENSE
index a423b6236a..5812061baa 100644
--- a/hugegraph-dist/release-docs/LICENSE
+++ b/hugegraph-dist/release-docs/LICENSE
@@ -221,7 +221,7 @@ hugegraph-core/src/main/java/org/apache/hugegraph/type/Nameable.java from https:
 hugegraph-core/src/main/java/org/apache/hugegraph/type/define/Cardinality.java from https://github.com/JanusGraph/janusgraph
 hugegraph-core/src/main/java/org/apache/hugegraph/util/StringEncoding.java from https://github.com/JanusGraph/janusgraph
 hugegraph-core/src/main/java/org/apache/hugegraph/traversal/optimize/HugeScriptTraversal.java from https://github.com/apache/tinkerpop
-
+hugegraph-core/src/main/java/org/apache/hugegraph/backend/id/SnowflakeIdGenerator.java from https://github.com/twitter-archive/snowflake
 
 ========================================================================
 Third party Apache 2.0 licenses