Redmine

Hello everyone,
I've already post this on Bitnami forums and they told me to ask here :)
I'd like to know if there is a way to set 'Commentaries' as mandatory when you add spent time into an issue.
My proyect leaders need to know how and doing what their teams spends assigned time.
Until today they just add hours into issues.
I attached a picture for you to be easier to understand

Thanks for your time,
Best regards