diff --git a/Drivers/STM32F1xx_HAL_Driver/Src/stm32f1xx_hal_pcd.c b/Drivers/STM32F1xx_HAL_Driver/Src/stm32f1xx_hal_pcd.c
index 4754352..33fa7e0 100644
--- a/Drivers/STM32F1xx_HAL_Driver/Src/stm32f1xx_hal_pcd.c
+++ b/Drivers/STM32F1xx_HAL_Driver/Src/stm32f1xx_hal_pcd.c
@@ -1027,7 +1027,7 @@ void HAL_PCD_IRQHandler(PCD_HandleTypeDef *hpcd)
 #if (USE_HAL_PCD_REGISTER_CALLBACKS == 1U)
         hpcd->SuspendCallback(hpcd);
 #else
-        HAL_PCD_SuspendCallback(hpcd);
+        //HAL_PCD_SuspendCallback(hpcd);
 #endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
       }
       __HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_USBSUSP);
diff --git a/README.md b/README.md
index 06ba6b8..62f7b7f 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,8 @@
 # NaviKit_stm32
  导航套件源码，STM32F107VCT6，开发环境STM32CubeIDE
+
+# Note
+ 在使用usb的时候，
+ `stm32f1xx_hal_pcd.c文件内`
+ `void HAL_PCD_IRQHandler(PCD_HandleTypeDef *hpcd)函数内` 
+ `HAL_PCD_SuspendCallback(hpcd) 代码段` 务必屏蔽，否则导致枚举失败，提示获取设备描述符失败。
\ No newline at end of file