English Phraseology Question

[Pugachev Cobra]

PPRuNers...

Just a small question here:

When I'm on an AFIS frequency, and I'm parked and ready to shutdown, I use "XYZ leaving frequency at ZYX."

But I've recently been confronted that you can (or should) use, instead of 'leaving frequency', "Vacating frequency".

I never heard that one, and in fact I think you use vacating only when exiting a physical place, most often being the runway.

But, I may be wrong. If someone here uses "vacating frequency" in any situation as standard phraseology, please let me know.

Also if someone knows about a document referring to the use of vacating frequency in phraseology, would be nice.

Thanks!