An internal description or comment field would be awesome.

We are 2 editors that write content on the website/newsletters, and in many cases need to add notes to a newsletter draft, like "section X is not done" or "Make sure post Y is published before sending this email".

So far we manage those comments via a chat tool, but it would be AWESOME to have a field for internal remarks (or a description-field) that we can use for this.