Sometimes, someone edits my posts. The edits were very helpful, so I want to thank them.
How do I thank someone for a helpful edit to my post? Adding a comment, or something else?
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Thanks are not expected for editing. I suspect that simply accepting them rather than rolling them back will be all that editors want.
Using the occasional comment to thank should do no great harm but I recommend not doing it often and, when you do, be specific about what you are thanking them for.
A comment that says little more than thanks has no value.
@ notifications can also be used to ping editors. So a comment can make the editor aware of your gratefulness. As already stated, this is not the intended purpose of comments, but you can always delete the comment after a while, when you think it reached its target.
As there is no mechanism to reward outstanding edits with extra reputation, I do not consider it a problem if the editor is at least rewarded with some verbal praise in a comment. By contrast, thanking people for questions and answers is much less called for as there are mechanisms for this (votes and bounties).
An alternative to leaving a comment is checking whether the editor is active in the site’s chatrooms and contact them there.