In the Attachments tab I can add a Description when uploading a new file.  That file can then be checked out and when checked back in a new Description can be entered.  I like to use the Description field as a comments field to give some context to the particular version of the file being uploaded.
 
To view previous versions of the file I then click on the History button.  However, the only details available are Version #, File Name, Date, and User.  I would like to also have the ability to see the Descriptions of the previous versions.
 
Thanks.
 
Joe Hendrickson