diff --git a/nmcli-with-gsm.md b/nmcli-with-gsm.md
index ca7f241..cdd35b1 100644
--- a/nmcli-with-gsm.md
+++ b/nmcli-with-gsm.md
@@ -1,7 +1,7 @@
 My 4G modem
 
 ```
-/org/freedesktop/ModemManager1/Modem/1 [QUALCOMM INCORPORATED] SIMCOM_SIM7600G-H
+/org/freedesktop/ModemManager1/Modem/0 [QUALCOMM INCORPORATED] SIMCOM_SIM7600G-H
 ```
 
 
@@ -13,6 +13,10 @@ sudo nmcli c add type gsm ifname cdc-wdm0 con-name 4GNet apn 3gnet gsm.username
 
 then we can see a `4GNet` in NetworkManager (like KDE's network manager UI)
 
+I got the cdc-wdm0 from 
+```
+mmcli -m 0 | grep "primary port"
+```
 
 here is reference arguments I've used for nmcli