This is another page that is linked to the Chapter 10 via the Chapter number used and is sorted based on the TOC Order.
There is not a link to this page via the Header, Footer nor the Sidebox.
This page is only seen if the "main" link is selected and then it will show in the TOC listing.
This is a handy way to have numerous links that are related but only show one main link to get to them all.