Chen and colleagues’ paper (published online 4 December 2023) reports fieldwork from 6 May to 22 December 2016. Of 3,974 academic economists contacted, 1,603 agreed to help and 512 provided at least one Wikipedia comment. These count people, not comments, and combine all six invitation-message groups. The messages varied messages suggesting an article matched the recipient’s expertise, promised recognition and readership information. Chance assignment—like drawing lots—aims to make message groups comparable before their invitations. Combined totals do not show which message helped or prove an effect exactly zero. Willingness differs from delivered work; commenting here does not establish recurring qualified scientific review. This selected discipline and task supply no universal expert-participation rate.