@mentioning People on the Boards
While working on the board, you may need to quickly notify someone about the changes you’re making. You can do that by simply @mentioning them in a comment or chat.
To mention a board participant in a comment or chat, type “@” followed by the person’s first and surname, or just pick the right person from the suggestions list that pops up when you start typing.
When you post mentions on the board, people you mentioned will get an instant browser notification, if they are online, or an email notification if they are not. Feel free to update notification settings in your profile if you don't want to receive emails when collaborators mention you.
You can also quickly notify every participant on the board — just type @board in comments or chat and everyone will get a browser or email notification.