diff --git a/gossip-base/src/main/java/org/apache/gossip/crdt/CrdtAddRemoveSet.java b/gossip-base/src/main/java/org/apache/gossip/crdt/CrdtAddRemoveSet.java
index 55ba019..6d44735 100644
--- a/gossip-base/src/main/java/org/apache/gossip/crdt/CrdtAddRemoveSet.java
+++ b/gossip-base/src/main/java/org/apache/gossip/crdt/CrdtAddRemoveSet.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 org.apache.gossip.crdt;
 
 import java.util.Set;