In the course of the transmission of the text of the New Testament variants in the text emerged many times and in different ways. This article shows the importance of the study of corrections in the course of building theories about the emergence of specific variants. It presents some exemplary results of the examination of corrections of a few manuscripts of Acts. The article shows that examining all the corrections in a work in an individual manuscript can give important hints on the emergence of specific variants because it allows to make judgement about the character of the copying and the correcting.