1 files changed, 1 insertions, 0 deletions

diff --git a/README.md b/README.md
index 8a236f5..416d935 100644
--- a/README.md
+++ b/README.md
@@ -285,6 +285,7 @@ boards:
       idproduct: the PID of the UART (Formated as 0xXXXX)
       serial: The serial number in case of FTDI uart
       devpath: the UDEV devpath to this uart for UART without serial number
+      interfacenum:	(optional) The interfacenumber of the serial. (Used with two serial in one device)
       use_ser2net: True/false (Use ser2net instead of conmux-console)
       use_screen: True/false (Use screen via ssh instead of conmux-console)
     connection_command: A command to be ran for getting a serial console