Need to show a border bottom on the last row of the table of the page

I am creating invoices with pdfmake (client side), showing individual expense lines in a table. Horizontal borders for this table are at the top and bottom of the single header row, and at the bottom of the table. However, if the table stretches to a second page, there is no bottom border on the first page.

How do I go about creating a bottom border on the table's last row for each page?