 Note that the distinction between internal and external explanation relations is related to, but cross-cuts, another influential distinction by Wesley Salmon, between ontic and epistemic accounts of explanation (Salmon 1989; for discussion see Bechtel &amp; Abrahamsen 2005 and Craver 2014). Salmon’s distinction has come in for criticism (see, e.g., Illari 2013; Bokulich 2016, 2018), because among other things it is not clear why epistemic accounts should not be ontic or world-involving; knowledge is an epistemic concept, after all, but it is ontic or world-involving in virtue of the truth condition. The distinction between explanatory internalism and externalism plausibly avoids this concern.