 In addition to facts about particular people being justified in believing particular propositions, [traditionalists] are committed to the existence of epistemic facts about what beliefs are supported by a particular body of evidence. It remains unclear whether these are natural facts. Traditionalists often regard these facts as necessary truths, and it is their necessity that enables evidentialists to endorse the supervenience thesis. [On standard definitions of supervenience, necessary truths supervene on any facts—so, trivially, they supervene on natural facts.]….[But it] is legitimate to ask whether they count as natural facts. (Feldman 2012: Section 4)