diff --git a/Makefile b/Makefile
index 5993a5d..0f7f0b1 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,7 @@
+#
+# Copyright (c) 2017 Yu Ishikawa.
+#
+
 .PHONY: test checkstyle clean
 
 all: checkstyle test package
diff --git a/bigquery-to-datastore.sh b/bigquery-to-datastore.sh
index f737d61..ed5a84a 100755
--- a/bigquery-to-datastore.sh
+++ b/bigquery-to-datastore.sh
@@ -1,5 +1,9 @@
 #!/bin/bash
 
+#
+# Copyright (c) 2017 Yu Ishikawa.
+#
+
 ARGS=$@
 
 MAIN_CLASS='com.github.yuiskw.beam.BigQuery2Datastore'
diff --git a/src/main/java/com/github/yuiskw/beam/BigQuery2Datastore.java b/src/main/java/com/github/yuiskw/beam/BigQuery2Datastore.java
index 2ad6b5c..73a1bd6 100644
--- a/src/main/java/com/github/yuiskw/beam/BigQuery2Datastore.java
+++ b/src/main/java/com/github/yuiskw/beam/BigQuery2Datastore.java
@@ -1,3 +1,6 @@
+/**
+ * Copyright (c) 2017 Yu Ishikawa.
+ */
 package com.github.yuiskw.beam;
 
 import java.util.LinkedHashMap;
diff --git a/src/main/java/com/github/yuiskw/beam/TableRow2EntityFn.java b/src/main/java/com/github/yuiskw/beam/TableRow2EntityFn.java
index 5213b91..5d2f3ff 100644
--- a/src/main/java/com/github/yuiskw/beam/TableRow2EntityFn.java
+++ b/src/main/java/com/github/yuiskw/beam/TableRow2EntityFn.java
@@ -1,6 +1,8 @@
+/**
+ * Copyright (c) 2017 Yu Ishikawa.
+ */
 package com.github.yuiskw.beam;
 
-
 import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
diff --git a/src/test/java/com/github/yuiskw/beam/BigQuery2DatastoreTest.java b/src/test/java/com/github/yuiskw/beam/BigQuery2DatastoreTest.java
index fb5981b..205cba6 100644
--- a/src/test/java/com/github/yuiskw/beam/BigQuery2DatastoreTest.java
+++ b/src/test/java/com/github/yuiskw/beam/BigQuery2DatastoreTest.java
@@ -1,3 +1,6 @@
+/**
+ * Copyright (c) 2017 Yu Ishikawa.
+ */
 package com.github.yuiskw.beam;
 
 import java.util.LinkedHashMap;
diff --git a/src/test/java/com/github/yuiskw/beam/TableRow2EntityFnTest.java b/src/test/java/com/github/yuiskw/beam/TableRow2EntityFnTest.java
index 0daf2b2..055458b 100644
--- a/src/test/java/com/github/yuiskw/beam/TableRow2EntityFnTest.java
+++ b/src/test/java/com/github/yuiskw/beam/TableRow2EntityFnTest.java
@@ -1,3 +1,6 @@
+/**
+ * Copyright (c) 2017 Yu Ishikawa.
+ */
 package com.github.yuiskw.beam;
 
 import java.text.ParseException;