How to make guides global

Hello, how do I set a GSGuide to global? Can’t find this in the docs. Thanks!

guide = GSGuide()
Font.masters[0].guides.append(guide)

or

guide = Layer.guides[0]
del(Layer.guides[0])
Font.masters[0].guides.append(guide)

Ah, I just append it to the master! Thanks, that makes a lot of sense.