[Tagging] tagging LPG only station

[Mateusz Konieczny]

How to tag fuel station with only LPG fuel?

https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dfuel <https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dfuel> and
https://wiki.openstreetmap.org/w/index.php?title=Key:fuel:lpg <https://wiki.openstreetmap.org/w/index.php?title=Key:fuel:lpg>
failed to help with that.

amenity=fuel
fuel:lpg=yes

is a good start but how one may explicitly add that 
no other fuel type is sold there?

I encountered https://www.openstreetmap.org/note/1282285 <https://www.openstreetmap.org/note/1282285> and now
I have no idea how to improve tagging there (and I prefer to know that before I 
check that anonymous reporter was right)
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