diff --git a/Demo-Build/RISC-V32/readme.txt b/Demo-Build/RISC-V32/readme.txt
index f2d4bc9c..15019f8f 100644
--- a/Demo-Build/RISC-V32/readme.txt
+++ b/Demo-Build/RISC-V32/readme.txt
@@ -103,16 +103,16 @@ RISC-V32 之系统构建
 /* 例程-main */
 int main(void)
 {
-	/* USER INIT CODE BEGIN */
-	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
-	SystemCoreClockUpdate();
-	Delay_Init();
+    /* USER INIT CODE BEGIN */
+    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
+    SystemCoreClockUpdate();
+    Delay_Init();
 ////USART_Printf_Init(115200);
-	USART1_UART_Init (115200);
-	printf("SystemClk:%d\r\n",SystemCoreClock);
-	printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
-	printf("This is printf example\r\n");
-	/* USER INIT CODE END */
+    USART1_UART_Init (115200);
+    printf("SystemClk:%d\r\n",SystemCoreClock);
+    printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
+    printf("This is printf example\r\n");
+    /* USER INIT CODE END */
 
     /* USER DEBUG CONFIG */// for CosyOS-Taskmgr
     #if (SYSCFG_DEBUGGING == 1)
@@ -121,7 +121,7 @@ int main(void)
         Debug_Config();
     }// defined in demo_debug.c
     #endif
-    
+
     /* USER 启动 CosyOS */// 在main函数的末尾处
     if(1){
         #if 1 // 建议前期调试时开启，如果CosyOS启动失败会返回错误码提示用户！
@@ -132,7 +132,7 @@ int main(void)
         #endif
     }
 
-	while(1);
+    while(1);
 }
 
 /* 例程-SysTick_Handler */// 根据是否启用硬件压栈，选择相匹配的声明方式：
@@ -169,7 +169,7 @@ MPIE：进中断前中断使能状态
 MIE： 机器模式中断使能
 */
 
-/* 例程-断点测试钩子 */
+/* 例程-断点测试钩子 */// for 硬件压栈
 void test_breakpoint_hook(void)
 {
     printf("break point test failed\r\n");