In UXPressia, you can refer to your team members directly in your documents or comments. Type the "@" sign in a comment or cell and start typing — you'll see that all the people you've shared the document with are available to mention:

You can use mentions to assign tasks within the document to other people:

People who get mentioned will receive email notifications.

Note: You can update notification preferences on your profile page:

You can also set up Slack notifications.