When Update for subitem is added, I want to be notified

When I create an update for a subitem for an employee, I want to receive an email of this. There is only an automation to get a notification when an update for an item is created.

However, when my supervisor leaves an update on any subitem, I get an email, but I don't see any automations set up for this. I'm just wondering if employees that are assigned to a subitem get automatically notified of any updates or if this is supposed to be an automation that is hidden somewhere. When I leave updates in other people's subitems, I don't get a notification (I am not assigned to the item).

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