OS X Aqua apps - update?

I've just skimmed through the Apple Human Interface Guidelines, but I can't spot where the 'Check for Updates' option is supposed to go in a desktop app under Aqua. I really like this feature, esp. when the app goes off, downloads the update, and unpackages and deals with any migration of existing versions/data etc without having to mess about with it. But it's never in the same place in every app!

Sometimes it's under the Application menu, sometimes under the Help menu, and sometimes hiding in a preferences panel for the app somewhere. Personally, it logically should be under the Application menu, as it's an application action (not a 'help' action really).

Weird that it's not documented in the guidelines. Hint, hint Apple!