diff --git a/README.md b/README.md
index 643edda..87cc9b6 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Inverter GUI
 
-The invertergui allows the monitoring of a [Victron Multiplus](https://www.victronenergy.com/inverters-chargers/multiplus-12v-24v-48v-800va-3kva) via the [MK3/MK2 USB](https://www.victronenergy.com/accessories/interface-mk3-usb) device.
+The invertergui allows the monitoring of a [Victron Multiplus](https://www.victronenergy.com/inverters-chargers/multiplus-12v-24v-48v-800va-3kva) via the [MK3/MK2 USB](https://www.victronenergy.com/accessories/interface-mk3-usb) or the MK2 RS232.
 
 The `ncthompson/invertergui` docker image is a build of [invertergui](https://gitlab.com/ncthompson/invertergui)
 
@@ -250,4 +250,4 @@ The intertergui application makes use of a serial tty device to monitor the Mult
 Example
 ```
 -dev=/dev/ttyUSB0
-```
\ No newline at end of file
+```