diff --git a/rt-thread-version/rt-thread-standard/programming-manual/device/hwtimer/hwtimer.md b/rt-thread-version/rt-thread-standard/programming-manual/device/hwtimer/hwtimer.md
index ee42ecada9578fefa9a1e9a813423fbfc435f67d..171dfa0c96fa93717928b5251fe7b8d28f13b846 100644
--- a/rt-thread-version/rt-thread-standard/programming-manual/device/hwtimer/hwtimer.md
+++ b/rt-thread-version/rt-thread-standard/programming-manual/device/hwtimer/hwtimer.md
@@ -116,6 +116,8 @@ static int hwtimer_sample(int argc, char *argv[])
     rt_device_open(hw_dev, RT_DEVICE_OFLAG_RDWR);
     /* 设置超时回调函数 */
     rt_device_set_rx_indicate(hw_dev, timeout_cb);
+    
+    return 0;
 }
 ```
 
@@ -189,6 +191,7 @@ static int hwtimer_sample(int argc, char *argv[])
     /* 设置模式为周期性定时器 */
     mode = HWTIMER_MODE_PERIOD;
     rt_device_control(hw_dev, HWTIMER_CTRL_MODE_SET, &mode);
+    return 0;
 }
 ```
 
@@ -253,6 +256,8 @@ static int hwtimer_sample(int argc, char *argv[])
     timeout_s.sec = 5;      /* 秒 */
     timeout_s.usec = 0;     /* 微秒 */
     rt_device_write(hw_dev, 0, &timeout_s, sizeof(timeout_s));
+    
+    return 0;
 }
 ```