updated Readme

README.md

@@ -243,7 +243,7 @@ If the seconds are under 5 then the service crashes and gets restarted all the t
 ## Adapter
 ### Adapter PCB
 
-I have just created a little adapter pcb with a level shifter for RX and TX.   
+I have just created a little adapter pcb with a level shifter and isolation for RX and TX.   
 With this you can use a standard ve.direct cable:
 <p align="center">
 <img src="https://github.com/wasn-eu/Victron_BlueSmart_IP22/blob/master/Images/adapter_pcb.jpg?raw=true" width=500>