When we comment about others' answers or questions, we may want to notify the other user. As far as I known, we can type @username_you_want to mention the user you want get in touch with.

Most times I tried, when I type the first word of a username, the system will give a auto-complete of the user, like this:

Enter image description here

However, sometimes the auto-complete did not happen. In this situation, I type the username handy, but I really don't know whether I notified the user successfully. Here is an example:

Enter image description here

I don’t know why this happens. Did I make any mistakes which stops the auto-complete function?

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    In that second case, philshem is the author of the answer, so with out mention their name, the comment will reach them. – Arulkumar Jan 31 '20 at 5:44
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    @Peter Editing "enter image description here" to "Enter image description here" Seriously? Is that a useful edit? – Lightness Races in Orbit Feb 1 '20 at 12:08
  • @tchrist On the same topic, I just noticed that your edit to the title completely changed its meaning. It wasn't "broken English": tab-completion and notifications are two different features. Please be more careful! – Asteroids With Wings Feb 2 '20 at 18:32

When you comment on a post (question or answer) the poster (asker or answerer) is always pinged automatically. Therefore there is no assistance needed to include their name in order for them to be alerted to your comment.

For more about how pinging works see How do comment @replies work?.

I trust the now deleted comment of @Catija posted to this answer

That said, if two people other than the [poster] comment, the [poster]’s username will autocomplete.

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    In fact if you do type out the name it gets automatically removed. – Alex Feb 1 '20 at 23:39

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