diff --git a/zh-cn/device-dev/subsystems/subsys-usbservice-guide.md b/zh-cn/device-dev/subsystems/subsys-usbservice-guide.md
index 7340a41e7fdf4651a50c4d67a4238303f40cd0f9..ea46f8f7e445897feb58684f702ef578e466a8f8 100644
--- a/zh-cn/device-dev/subsystems/subsys-usbservice-guide.md
+++ b/zh-cn/device-dev/subsystems/subsys-usbservice-guide.md
@@ -34,8 +34,7 @@
 5. 配置设备接口
 
    ```cpp
-   ret = g_usbClient.ClaimInterface(pip, interface, true);
-   interface为deviceList中device的interface。
+   ret = g_usbClient.ClaimInterface(pip, interface, true); //interface为deviceList中device的interface。
    ```
 
 6. 数据传输