Horn buttons wiring

On my 86 F150, the key was sticking and not returning to run position when released once started. So I took it apart and gave it a good cleaning. The key is now working good. I put everything back together and started to install the horn button, but I cannot remember how the black ground wire attaches. The yellow and blue one were not problem as their is only one way they could go on.

I have no idea where to attach the black ground, I did not take a picture before taking the wires off. I did with the rest of it, just not the horn button.

The black ground wire’s tab just goes in one of the holes in the hub next to the nut.

Thanks Gary