How can I "mention" or "tag" a specific user in a comment?

The goal is to respond/reply to a comment from a specific user and to draw that user's attention.

I seem to remember being able to type @username for this but that doesn't (always?) work.

Example: How to add X-Forwarded-for header in reverse proxy with SSL passthrough I want to reply to Steffen Ulrich's comment. Then I type @stef a pop-up dialog is shown with SteffenUlrich and I can click that pop-up to complete the username. Yet when I do I don't see any indication that this is a link.

I tried to add a dash between Steffen and Ulrich because the user's profile URL contains a dash but that does not work either.

1 Answer 1


It's not a link, but the 'ping' works. As @AdminBee notes in the comments, only the first three characters matter. That the space disappears when you click his name

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is expected behaviour. What might surprise you is that you do not even need to mention his name to ping him; since you're the only two users in that comment thread, he is automatically notified.

For more information, see the Help Center article or the FAQ on Meta Stack Exchange: How do comment @replies work?

  • 1
    Heh, you beat me there ;) Just a comment: The Help page indicates that only the first three letters after the @ are actually used for user matching when pinging, so this kind of typo should not matter in addressing the user mentioned here.
    – AdminBee
    Commented Jan 5, 2021 at 9:36

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