diff --git a/arch/arm/cortex-m4/coreclock.c b/arch/arm/cortex-m4/coreclock.c
index 1b03f6d2a..9d0593ec2 100644
--- a/arch/arm/cortex-m4/coreclock.c
+++ b/arch/arm/cortex-m4/coreclock.c
@@ -51,12 +51,23 @@
 
 /**
 * @file coreclock.c
-* @brief derived from ST standard peripheral library
+* @brief support SystemCoreClockUpdate function
 * @version 1.0 
 * @author AIIT XUOS Lab
-* @date 2021-04-25
+* @date 2021-04-29
 */
 
+/*************************************************
+File name: coreclock.c
+Description: support SystemCoreClockUpdate function
+Others: 
+History: 
+1. Date: 2021-04-29
+Author: AIIT XUOS Lab
+Modification: 
+1. take system_stm32f4xx.c for XiUOS
+*************************************************/
+
 #include "stm32f4xx.h"
 
 uint32_t system_core_clock = 16000000;
diff --git a/arch/arm/cortex-m4/interrupt.c b/arch/arm/cortex-m4/interrupt.c
index 029db1e56..d1393528f 100644
--- a/arch/arm/cortex-m4/interrupt.c
+++ b/arch/arm/cortex-m4/interrupt.c
@@ -10,6 +10,14 @@
 * See the Mulan PSL v2 for more details.
 */
 
+/**
+* @file interrupt.c
+* @brief support arm cortex-m4 interrupt function
+* @version 1.0 
+* @author AIIT XUOS Lab
+* @date 2021-04-29
+*/
+
 #include <xs_base.h>
 #include <xs_isr.h>
 #include <misc.h>
diff --git a/arch/arm/cortex-m4/system_init.c b/arch/arm/cortex-m4/system_init.c
index 2ac3edce5..bde593cf3 100644
--- a/arch/arm/cortex-m4/system_init.c
+++ b/arch/arm/cortex-m4/system_init.c
@@ -50,13 +50,24 @@
   */
 
 /**
-* @file coreclock.c
-* @brief derived from ST standard peripheral library
+* @file system_init.c
+* @brief support SystemInit function
 * @version 1.0 
 * @author AIIT XUOS Lab
-* @date 2021-04-25
+* @date 2021-04-29
 */
 
+/*************************************************
+File name: system_init.c
+Description: support SystemInit function
+Others: 
+History: 
+1. Date: 2021-04-29
+Author: AIIT XUOS Lab
+Modification: 
+1. take system_stm32f4xx.c for XiUOS
+*************************************************/
+
 #include "stm32f4xx.h"
 
 #if !defined  (HSE_VALUE) 
diff --git a/arch/risc-v/k210/interrupt.c b/arch/risc-v/k210/interrupt.c
index c081d8215..9edc34fff 100644
--- a/arch/risc-v/k210/interrupt.c
+++ b/arch/risc-v/k210/interrupt.c
@@ -1,15 +1,38 @@
-/*
-* Copyright (c) 2020 AIIT XUOS Lab
-* XiUOS is licensed under Mulan PSL v2.
-* You can use this software according to the terms and conditions of the Mulan PSL v2.
-* You may obtain a copy of Mulan PSL v2 at:
-*        http://license.coscl.org.cn/MulanPSL2
-* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
-* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
-* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
-* See the Mulan PSL v2 for more details.
+/* Copyright 2018 Canaan Inc.
+ *
+ * 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
+ *
+ *     http://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.
+ */
+
+/**
+* @file interrupt.c
+* @brief support k210 interrupt configure
+* @version 1.0 
+* @author AIIT XUOS Lab
+* @date 2021-04-29
 */
 
+/*************************************************
+File name: interrupt.c
+Description: support k210 interrupt configure
+Others: take plic.c for references from Canaan k210 SDK
+*                https://canaan-creative.com/developer
+History: 
+1. Date: 2021-04-29
+Author: AIIT XUOS Lab
+Modification: 
+1. support K210 interrupt configure
+*************************************************/
+
 #include "tick.h"
 #include <clint.h>
 #include <interrupt.h>