In OneNote, you can have a page marked as ‘read’ or ‘unread’ for another person to see. This is useful for letting that person know that you want them to read the page. To do this, simply right-click on the page title (on the right of the page) and select Mark as Unread. You can also use CTRL+Q to do this.
This will make the page name appear in bold until the page is clicked on. After it has been viewed, the title will return to normal.