[ Format ]
Sending a document around for review should include three pieces of information: a deadline, the context, and, a preferred format for comments.
Comment format is not a well-developed part of knowledge work. With all of the advances in technology, the task of marking up text documents seems to have missed the boat. Most review cycles I see are more disorganised than they could be.
As a minimum, tell reviewers whether you prefer in-document markups (track changes), or commentary in the margins.
You’re in charge of the process, so think about what you want. And then, tell them what to do.