diff --git a/src/main/java/org/opencord/igmpproxy/SingleStateMachine.java b/src/main/java/org/opencord/igmpproxy/SingleStateMachine.java
index ceaac52..c974fcb 100644
--- a/src/main/java/org/opencord/igmpproxy/SingleStateMachine.java
+++ b/src/main/java/org/opencord/igmpproxy/SingleStateMachine.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * 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 org.opencord.igmpproxy;
 
 import org.onlab.packet.Ethernet;
@@ -7,7 +22,7 @@
 import java.util.Random;
 
 /**
- * State machine for single IGMP group member. The state machine is implemented on 
+ * State machine for single IGMP group member. The state machine is implemented on
  * RFC 2236 "6. Host State Diagram".
  */
 public class SingleStateMachine {