ezyVet has two methods that you can use to add comments to an invoice.

An invoice that shows in the invoicing screen has a Comments box. Comments that you add to the Comments box show in the invoicing screen and show on the printed invoice.

An invoice that shows in the invoicing screen has an Others tab. If you select the Others tab, ezyVet shows a screen that has a plus button adjacent to Comments:

If you select the plus button, ezyVet shows a New Comment dialog box that you can use to add invoice comments.

The New Comment dialog box has an Office Use Only setting:

If you select Office Use Only, ezyVet makes a private comment. A private comment does not show in a printed invoice. And only persons who are signed in to ezyVet can see the comment.

If you clear Office Use Only, ezyVet makes a public comment. A public comment shows in a printed invoice.