Full Idea
Maybe contextualism isn't a theory about knowledge at all, but about knowledge attributions. As such, it is not a piece of epistemology at all, but of philosophy of language.
Gist of Idea
If contextualism is about knowledge attribution, rather than knowledge, then it is philosophy of language
Source
Keith DeRose (The Case for Contextualism [2009], 1.7)
Book Reference
DeRose,Keith: 'The Case for Contextualism' [OUP 2009], p.18
A Reaction
DeRose takes this view to be wrong. At the very least this will have to include self-attributions, by the supposed knower, because I might say 'I know that p', meaning 'but only in this rather low-standard context'.