diff --git a/doc/specific_iocs/power_supplies/PS300.md b/doc/specific_iocs/power_supplies/PS300.md
index 2344fe05f7..749ae4b17c 100644
--- a/doc/specific_iocs/power_supplies/PS300.md
+++ b/doc/specific_iocs/power_supplies/PS300.md
@@ -12,8 +12,8 @@ If the device is dual polarity, this can be changed via a dial at the rear of th
 
 For RS232 control set the `PORT` macro to the moxa com port
 
-For GPIB set the `IPADDR` macro to the address of the Prologix GPIB adapter, and set the `GPIBADDR` macro to the GPIB address.
-This address will normally be 14, but check the menus on the device if you cannot connect.
+For GPIB set the `IPADDR` macro for the IOC in the IBEX configuration to the IP network address of the Prologix GPIB adapter,
+and set the `GPIBADDR` macro to the local device GPIB address (this address will normally be 14, but check the menus on the device if you cannot connect).
 
-You also need to choose the correct model number for the `MODEL` macro, with a `pos` or `neg` suffix for a dual polarity device. 
+You also need to choose the correct model number for the `MODEL` macro, with a `pos` or `neg` suffix for a dual polarity device e.g. `350_neg`. 
 The model name is a prefix to DB substitution files listed in https://github.com/ISISComputingGroup/EPICS-SRS_PS300/tree/main/ps300Sup