I would like to see the ability to add a callout to a notebook page. This would be a small colored block on which text could be written or typed with an arrow or other indicator to a point on the page. This would be similar to a GN post-it note, but it would have an arrow associated with it. My thought is that it would be useful for the callout to be low opacity until it is touched, at which time it would have 100% opacity so it can be read, and then when touched again would return to low opacity. This would make the underlying notes easy to read under the callout. there also could be an option for the opacity always to be high.

Callouts are useful when adding comments or notes to content, either to oneself or to collaborators. They are sort of like an informal footnote.

Callouts are common in Word, Acrobat and several other reader/editors, with various shapes for the box and the location indicator. Those should be reviewed for alternative appearances.