Some preprint servers discourage anonymous commentary. This mitigates potentially harmful commentary, since the individual is disclosed and will have to stand by their remarks. Indeed, in some cases, commentary might help a submitted paper (see “Can a preprint help my journal submission?). However, the usefulness and perhaps unintended consequences of commentary on preprint servers should be evaluated especially when more data has been acquired on this important issue. The sources of commentary received and desired by authors was documented in a survey of bioRxiv authors.