diff --git a/How-to-use-the-4G-extension.md b/How-to-use-the-4G-extension.md
index faf5449..b8cf826 100644
--- a/How-to-use-the-4G-extension.md
+++ b/How-to-use-the-4G-extension.md
@@ -8,7 +8,7 @@ run `enable_4g_cm4.sh` or `uconsole-4g-cm4 enable`, depends on the version of yo
 
 Please wait for it to complete, which may take about 20 seconds. Please be patient and try not press ctrl+c.  
 
-next is important, to check the version of your 4G extension by AT commands:
+next is **VERY IMPORTANT**, to check the version of your 4G extension by AT commands:
 
 ```
 echo -en "AT+CUSBPIDSWITCH?\r\n" | sudo socat - /dev/ttyUSB2,crnl