Apologies in advance, this may have already been proposed previously.
We are currently building a comprehensive data model for our business where we are also aiming to make the UX as smooth as possible. One really nice feature would be to add a short description of each attribute field in a feature class to help guide users as to it's purpose without the need of looking it up in a accompanying data dictionary. For example, in the below mouse mouseover tooltip for the 'Comments' field, have an additional 'Description' row.
Description: This field should be used to add any additional comments to the specific feature etc etc.
