iOS Notifications - do badges work?

HI all, I have notifications working fine on my iPhone - when motion is detected, I get a notification on my screen. I was wondering though, I have never seen any badge numbers on the app - if I have not actually tapped the notification or opened the app to check out the motion notificaiton alert, I would expect to see a red '1' badge over the app. Are badges used like this, or is there jo badge support inthe app? thanks!