Guess I could test this on a live system but what happens if you post a topic and then edit it to include some more @usernames? Does the system send the notifications just to the new username added?
The answer to your question is yes.
If you (or a moderator) edit your post later to add more @ mentions, those people (or groups) will indeed be notified (assuming they have access to the post).
This is a common question in our community. We use it all the time.
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Ah, I misread the question, sorry! I saw “tags” and missed the “@”. Yes, edits that add “mentions” will cause notifications - sorry for any confusion I may have caused.
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이것이 내가 Discourse를 
하는 이유 중 하나입니다. 정말 세심한 디테일 처리가 돋보이네요. 매우 유용하고, 기쁘게도 놀라울 정도입니다.
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