Where's the index for the User Guide for Notion4?

I accidentally posted this on the Notion for iPad forum (I feel silly that I made that mistake), so I figured I'd post it here. The User Manual says in the headings for chapter 15 that the Index starts on page 15.8 but the manual itself only goes to page 15.6, and I can't find the index anywhere. I did eventually find the answer I was looking for, but that was serendipity. I'd really love to be able to look things up in the index. 
