[otrs] Notify new owner of ticket?

I know there is a way to notify the new owner of a ticket, but I cant find it anywhere. Under "Admin" if I click "Notifications" I can see the en:Agent:OwnerUpdate notification. However, I cannot figure out how to assign this to a user/queue? Anyone have any idea? -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.409 / Virus Database: 268.13.21/511 - Release Date: 11/1/2006