diff --git a/bsp/esp32/README.md b/bsp/esp32/README.md
index 4239ad7d6..609bec434 100644
--- a/bsp/esp32/README.md
+++ b/bsp/esp32/README.md
@@ -9,3 +9,5 @@ esp-idf 5.0
     idf.py set-target <esp32c3/esp32s3>
     make.bat
     ```
+- tips
+  - use ESP's USB port to flash code, not the COM port.
\ No newline at end of file