diff --git a/README.md b/README.md
index ab53826..2758770 100644
--- a/README.md
+++ b/README.md
@@ -10,9 +10,12 @@
 ```bash
 http://Digistump.com/package_digistump_index.json
 ```
-3.`Click 'OK'`
-4.`Tools>Board>Boards Manager...`
-5.`search 'esp8266' and install it`
+3.`Click 'OK'`  
+4.`Tools>Board>Boards Manager...`  
+5.`search 'esp8266' and install it`  
+6.`Plug into your computer`  
+7.`Tools>Port`  
+> ⚠️ **Warning:** Make sure you have installed the correct USB driver (CH340 or CP2102) before connecting the ESP8266 to your computer.
 
 
 <p align="right">🔗 <strong>Blog:</strong> <a href="https://my-blog.example.com">my-blog.example.com</a></p>