diff --git a/dtmsvr/storage/sql/sql.go b/dtmsvr/storage/sql/sql.go
index 566d2f8..d87297a 100644
--- a/dtmsvr/storage/sql/sql.go
+++ b/dtmsvr/storage/sql/sql.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 sql
 
 import (