Currently there is no a way to achive this. We have eSignatures which could be set to have mandatory comments but this is only for approvals and lock of the editor. This looks like a nice feature in case you rise an enhancement.
regards,
Napoles
Salman Shaikh selected this answer as the correct answer
Dashboards and work items are no longer publicly available, so some links may be invalid. We now provide similar information through other means.
Learn more here.
