@mentions can be used in any comment field to give a shout out to an individual, group, whole company, or external contact (for High Fives). You can enable this feature for your company, if you are an administrator.
Enable @mentions for your company
1. Click on 'Settings' from the left navigation.
2. Click on 'Features' to expand the feature settings.
3. Click 'Manage features'.
4. Scroll down to the Permissions section and click 'Configure' to the right of the Mentions option.
5. Toggle to enable or disable group-specific or company-wide mentions.