I was wondering if this had been suggested before. Being able to add a note to a specific page for other moderators to see. For instance; you're sitting in the mod queue and at the top of the page there's a note from a fellow moderator saying
"Please remember to add specific flairs to all removed posts..."
The note could be anything at all, but all mods can see - and ideally be able to add a reply to that note; ie. if you've completed a task someone wanted done.
So if you need to easily communicate something with the other mods you can do so within Reddit. In my head, it's a bigger system of the user notes function, but instead for users, it's for each page.
https://www.reddit.com/r/toolbox/comments/78r7hi/idea_page_notes/