diff --git a/README.md b/README.md
index d41f459..c9df8cf 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,9 @@ The Dell Latitude E5*50 could have a "Dell Wireless 5809e Gobi™ 4G LTE Mobile
 | ID | 413c:81b1 |
 | Kernel module | qcserial |
 
-I created a udev rule which loads the ```qcserial``` module, switchs the ```bConfigurationValue``` from 2 to 1 and add the new device id ```413c:81b1``` to the ```qcserial``` driver.
+The device id of this Gobi™ module is still missing from the ```qcserial``` devices table, so I created a udev rule which loads the ```qcserial``` module, switchs the ```bConfigurationValue``` from 2 to 1** and add the new device id ```413c:81b1``` to the ```qcserial``` driver.
+
+** By default the device is loaded in the ```cdc_mbim``` mode (see https://www.kernel.org/doc/Documentation/networking/cdc_mbim.txt) instead in the classic serial modem mode.
 
 #### GPS ####