diff --git a/src/main/java/org/fluentd/logger/Sender.java b/src/main/java/org/fluentd/logger/Sender.java
index <HASH>..<HASH> 100644
--- a/src/main/java/org/fluentd/logger/Sender.java
+++ b/src/main/java/org/fluentd/logger/Sender.java
@@ -1,3 +1,20 @@
+//
+// A Structured Logger for Fluent
+//
+// Copyright (C) 2011 Muga Nishizawa
+//
+//    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.fluentd.logger;
 
 import java.io.BufferedOutputStream;
added copyright notation in Sender.java