diff --git a/rt-thread-version/rt-thread-standard/programming-manual/device/sensor/sensor.md b/rt-thread-version/rt-thread-standard/programming-manual/device/sensor/sensor.md
index be1b3cf2cc8b4beb3e202783d89f54c7c0b07976..37e1bf234d98f08b857c385ef0bb53275beba36d 100644
--- a/rt-thread-version/rt-thread-standard/programming-manual/device/sensor/sensor.md
+++ b/rt-thread-version/rt-thread-standard/programming-manual/device/sensor/sensor.md
@@ -256,7 +256,7 @@ rt_size_t rt_device_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t
 | dev                | 设备句柄                                       |
 | pos                | 读取数据偏移量，此参数传感器未使用                 |
 | buffer             | 缓冲区指针，读取的数据将会被保存在缓冲区中 |
-| size               | 读取数据的大小                                 |
+| size               | 读取数据的个数                                 |
 | **返回**           | ——                                             |
 | 读到数据的实际大小 | 返回读取到数据的个数           |
 | 0                  | 需要读取当前线程的 errno 来判断错误状态          |