How do you animate camera properties like Aperture?

I know this is a basic question, but I can’t figure out how to animate Camera properties that are not among the keyframe options when you press ‘i’.

According to Animating Cameras in the manual, Ipo’s should be used.

But, as I understand it, this feature doesn’t exist anymore - so, could anyone please link to a description of how you do it today?

OK, got it: You just hover over the desired (camera) property and press ‘i’.