diff --git a/dtmsvr/storage/boltdb/boltdb.go b/dtmsvr/storage/boltdb/boltdb.go
index e1af190..439cfd0 100644
--- a/dtmsvr/storage/boltdb/boltdb.go
+++ b/dtmsvr/storage/boltdb/boltdb.go
@@ -1,3 +1,9 @@
+/*
+ * Copyright (c) 2021 yedf. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
 package boltdb
 
 import (
diff --git a/dtmsvr/storage/boltdb/boltdb_test.go b/dtmsvr/storage/boltdb/boltdb_test.go
index 2e96a7c..70048ea 100644
--- a/dtmsvr/storage/boltdb/boltdb_test.go
+++ b/dtmsvr/storage/boltdb/boltdb_test.go
@@ -1,3 +1,9 @@
+/*
+ * Copyright (c) 2021 yedf. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
 package boltdb
 
 import (