Node Labeling

I found it would be really nice to have a place to label the individual ports on Din Rail Gateways.  Example I have installed on an FOH catwalk.  

I would like to label the ports so someone coming in to make changes knows where each port is wired.

Port 1 SR Box Boom

Port 2 SR Portal

Port 3 CSL Portal

Port 4 SL Box Boom