Update ReadMe.md

ReadMe.md

@@ -18,6 +18,17 @@ using an [USB-I2C communications module](http://www.robot-electronics.co.uk/htm/
 
 ``` sudo apt update && sudo apt install iri-lidar-lite-dev ```
 
+## Important information
+
+To use this driver is necessary to unload the *ftdi_sio* module, so the device is detected as a serial-usb device.
+This can be achieved with the following command
+   
+   ```sudo rmmod ftdi_sio```
+    
+or executing the following script:
+
+   ```unbind_ftdi_udev.sh -s <serial_number>```
+
 ## Disclaimer  
 
 Copyright (C) 2016-2019 Institut de Robòtica i Informàtica Industrial, CSIC-UPC.