This discussion note of Batterman 2010 clarifies the modest aims of my “mapping account” of applications of mathematics in science. Once these aims are clarified it becomes clear that Batterman’s “completely new approach” (Batterman 2010, p. 24) is not needed to make sense of his cases of idealized mathematical explanations. Instead, a positive proposal for the explanatory power of such cases can be reconciled with the mapping account.