As a developer, it would be VERY helpful if the AG app could provide a "Notes" field - basically a clone of the Description field.
The field should not be displayed in the app. It's best use, for me at least, would be to store custom app info as part of the project, so I could then parse the project file to derive app settings.
In a more general sense, for non-developers, it would be a place to store comments on why a field (or table) is as it is, but keep that information invisible from the end users.