What is To Buyer attachment for on Address Book>Manage Sites>Identification tab?

We're migrating JDE to Oracle. JDE Buyers have instructions that they want to view depending on which Contact they use, when creating a purchase order.  There doesn't appear to be any ability to attach to a Contact so, I tried adding it to the supplier site in the address book as a To Buyer.  It doesn't display  though when creating a purchase order.  Is there any way to add an attachment that's viewable to the buyer for a supplier site or contact?

Thanks for any suggestions.