Guido Melchior's important and rich book (Melchior Knowing and Checking. An Epistemological Investigation2019) draws our attention to the much neglected topic of checking. There are many new leads to follow. Here, I will pick a few that seem to me to allow the most room for discussion and disagreement: the alleged modal profile of checking (Sect. 1), the contrastive aspects of checking (Sect. 2), and the relation of checking to closure (Sect. 3). I will end with two smaller points worth bringing up here (Sect. 4).