In the rich text editor:
@moncerat
In a comment:
[moncerat](https://chowlings.com/user/moncerat)
For Names and Avatars:
In the rich text editor:
%moncerat
In a comment:
[![moncerat's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/moncerat) [moncerat](https://chowlings.com/user/moncerat)