Full Idea
To suggest that analytic truths make statements about linguistic conventions is a nonstarter; statements about linguistic conventions are contingent, whereas the statements made by typical analytic sentences are necessary.
Gist of Idea
Conventions are contingent and analytic truths are necessary, so that isn't their explanation
Source
Theodore Sider (Writing the Book of the World [2011], 06.5)
Book Reference
Sider,Theodore: 'Writing the Book of the World' [OUP 2011], p.101
A Reaction
That 'anything yellow is extended' is not just a convention should be fairly obvious, and it is obviously necessary. But we can say that bachelors are necessarily unmarried men - given the current convention.