diff --git a/How-to-use-the-4G-extension.md b/How-to-use-the-4G-extension.md
index b8cf826..18e2d0f 100644
--- a/How-to-use-the-4G-extension.md
+++ b/How-to-use-the-4G-extension.md
@@ -20,9 +20,11 @@ if you are other module number ,eg :9011
 
 you don't need any following steps
 
-just make suer the sim card inserted  correctlly,and use **sudo ifconfig** to see if there is a **usb0** 
+just make sure the SIM card inserted correctlly,and use **sudo ifconfig** to see if there is a **usb0** 
 
-if there is a usb0,then all is set, now you can use 4G card to view internet
+if there is a usb0,then all is set  
+
+normally you will have ipv4 and ipv6 address,now you can use 4G card to view internet
 
 ## 9001 part