diff --git a/internal/db/storage/blob/s3/reader/io/io.go b/internal/db/storage/blob/s3/reader/io/io.go
index c2a3e61583a..eea615a5b3f 100644
--- a/internal/db/storage/blob/s3/reader/io/io.go
+++ b/internal/db/storage/blob/s3/reader/io/io.go
@@ -1,3 +1,18 @@
+//
+// Copyright (C) 2019-2020 Vdaas.org Vald team ( kpango, rinx, kmrmt )
+//
+// 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
+//
+//    https://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 io
 
 import (
diff --git a/internal/db/storage/blob/s3/reader/reader_mock.go b/internal/db/storage/blob/s3/reader/reader_mock.go
index 446ec5ca169..417f1ed1283 100644
--- a/internal/db/storage/blob/s3/reader/reader_mock.go
+++ b/internal/db/storage/blob/s3/reader/reader_mock.go
@@ -1,3 +1,18 @@
+//
+// Copyright (C) 2019-2020 Vdaas.org Vald team ( kpango, rinx, kmrmt )
+//
+// 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
+//
+//    https://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 reader
 
 import (