F15 gnome shell software update notifications?

[Jurgen Kramer]

Do software update notifications suppose to appear on F15? Maybe I
missing something. 
I've been using F15 with gnome shell for a while now and I have never
seen a message telling me there are updates.

I have not found anything related to this in system settings. Only when
I open system info there is a button which says "Updates Available".

Confused...
Jurgen