https://meta.stackexchange.com/help/editing
An example reason to edit is:
To include additional information only found in comments, so all of the information relevant to the post is contained in one place
I recently ran into a subtlety with this editing reason. A user had added a comment to an answer, clarifying an explanation. I found this clarification useful, and from the votes, I presume other people did too.
So I submitted an edit suggestion, adding this information to the post.
This edit was rejected, and when I inquired why it was, I got the following explanation from a moderator for why the example given in the help page is not applicable in this case:
Not third party comments. The only source of information in a post should be the post's author.
Full context, in case I missed some important info (But I'm specifically not interested in what the correct thing to do in this case is. I want the help centre text to be less easy to misunderstand) And to be very clear: I have no objections to the edit being rejected because it was the right thing to do. There may even be multiple other reasons to reject it. But since an easy to understand (once you know it!) reason exists to not make the edit, this could all have been avoided.
This is an easy mistake to make! The correct interpretation of the editing reason requires one to deduce that "additional information only found in comments" means additional information by the post author, which is not a deduction I managed to figure out.
Could this example be reworded to make it less likely to interpret it in a way that implies relevant information could be added regardless of who wrote it?