Docs don't provide information about Adding Header/Footer to API service

[dev-bddw]

The documentation here is really confusing about how to add footers to pdfs. Can anyone provide an example? I am trying to add a footer to my pdfs.

[dev-bddw]

"HTML template to use as the footer of each page in the PDF. Currently Puppeteer basically only supports a single line of text and you must use pdf.margins+CSS to make the footer appear! See #77."

This is what's mentioned in the parameter. None of these things are defined clearly. What is included w/ the parameter? The Html template? What? Can anyone clarify?