Full Idea
It may be that the necessary/contingent distinction is tied to a metaphysics which recognises possibility as a real something wider than actuality.
Gist of Idea
The necessary/contingent distinction may need to recognise possibilities as real
Source
David M. Armstrong (What is a Law of Nature? [1983], 11.2)
Book Reference
Armstrong,D.M.: 'What is a Law of Nature?' [CUP 1985], p.163
A Reaction
Armstrong responds by trying to give an account of possibility in terms of 'combinations' from actuality. I think powers offer a much better strategy.