After performing some actions on a PSE post, a message pops up suggesting to do something else with the same post. Here are two examples:
- after downvoting a post the suggestion is to add a comment to explain why you downvoted.
- after upvoting an answer on your own question the suggestion is to accept one answer.
I don't know if more suggestions/reminders like these two exist.
I suggest to add another popup message that works like this: it will appear after someone edits a new contributor's post, and the suggestion is to explain why the edit was necessary. That would be particularly useful for new users that are not familiar with this site yet as many edits just add formatting or spoiler tags.
Ideally that comment can be added automatically if the post was edited from the review queues. In this case a good pre-filled comment would be:
Hi {username}, welcome to PSE. I edited your post because {reason}. Please take a look at the edited content so that you can do the same next time.
Where the {reason} part is taken from the edit summary.