diff --git a/How-to-use-the-4G-extension.md b/How-to-use-the-4G-extension.md
index 93180f4..e3cc63f 100644
--- a/How-to-use-the-4G-extension.md
+++ b/How-to-use-the-4G-extension.md
@@ -6,7 +6,10 @@
 
 run `enable_4g_cm4.sh` or `uconsole-4g-cm enable`, depends on the version of your os image, both can do the same job
 
-wait for couple seconds ,then use `mmcli -L` to see if there is a modem like
+Please wait for it to complete, which may take about 20 seconds. Please be patient and try not press ctrl+c.  
+
+then use `mmcli -L` to see if there is a modem like 
+
 ```
 /org/freedesktop/ModemManager1/Modem/0 [QUALCOMM INCORPORATED] SIMCOM_SIM7600G-H
 ```