diff --git a/bsp/realview-a8/rtt_api.h b/bsp/realview-a8/rtt_api.h
index 815e06e3a0a99574f9a10861ef928f04985b82e5..365e756351fb9496254842b8531bd3f13d376e6d 100644
--- a/bsp/realview-a8/rtt_api.h
+++ b/bsp/realview-a8/rtt_api.h
@@ -1,3 +1,31 @@
+/*
+ *  serial.c UART driver
+ *
+ * COPYRIGHT (C) 2014, Shanghai Real-Thread Technology Co., Ltd
+ *
+ *  This file is part of RT-Thread (http://www.rt-thread.org)
+ *
+ *  All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2014-04-07     Grissiom     first version
+ */
+
 #ifndef __RTT_API_H__
 #define __RTT_API_H__