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?
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The discussion addresses whether notifications are triggered when adding @mentions via post edits. Rob_Nicholson raises the question, and tobiaseigen confirms that yes, users or groups added via @mentions during an edit will receive notifications, provided they have access to the post. jomaxro initially misreads the question but clarifies that edits adding @mentions do indeed trigger notifications. JadeNorthrup praises Discourse for this thoughtful feature, calling it both useful and delightfully surprising. This functionality is commonly used in the community and reflects Discourse’s attention to detail in user experience.
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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This is one of the reasons I 
Discourse so much. What attention to detail. This is super-useful, and delightfully surprising.
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