install-compute-machines.md

@@ -6,7 +6,7 @@ After physical installation, plug four 1G network connections into the first fou
 
 Next, create a PXE boot USB stick. This can be done with a USB stick of larger than 128Mb that allows you to write to it on the block level, using, for example, dd or [Win32DiskImager](https://sourceforge.net/projects/win32diskimager/files/latest/download). Write the provided iso file onto the USB stick. You will need one per compute node. Insert these PXE boot USB sticks into any USB socket on the compute machines.
 
-Now, Get the MAC address of the first port on each compute node, and update the database to include these values into the compute A and compute B serial number values. The number consists of 12 positions and should start with 78d0042xxxxxx. Compute A should be the one connected to Switch 2, and Compute B the one connected to Switch 3.
+Now, Get the MAC address of the first port on each compute node, and update the database to include these values into the compute A and compute B serial number values. The number consists of 12 positions and should start with 78d0042xxxxxx - this should be in any included paperwork, but also the ipxe boot sticks will print this out to any attached screen when plugged in - the interface you want is net1. Compute A should be the one connected to Switch 2, and Compute B the one connected to Switch 3.
 
 Lastly, boot the machines. They should automatically get their filesystem and begin processing.