How are you sending information to an approver when you code an invoice?

Summary:

Currently when you add a requestor to an invoice and the invoice is sent to the requestor for coding, the coder can code the invoice and then there is a comment section before you submit, where you can type a comment. If you type anything in the comment section that does not go to the approver. What is that section used for? If you as the coder need to get information to the approver how are you doing this? When information is typed in this comment section where does it go? We feel like it