Does anyone have any information on the "A personal task I've assigned to someone else is completed" Notification?

[JamesM-MERGE]

Does anyone have any information on the "A personal task I've assigned to someone else is completed" Notification?

I do not see it in Setup > Email > Notifications list and cannot find any info here on XL.
In a customer instance a sys admin user has this Notification listed in their Edit Person screen > Requests I Have Made section, but I (also a sys admin) do not have it in my Notification list.

[MoniqueEvans]

I just checked my Setup area and can confirm that there are no "personal task" options available, but it does show in my user notification list as an option. I'm assuming this is one we cannot edit as admins (not sure why, and don't agree with it). Not sure if this helps answer your question, but at least you know you're not alone.