ubuntu one flow problem

I am reading the Ubuntu Manual rev. 788 (as part of the "Show us ya bugs" initiative), and in Chapter 3, on p. 72, I have discovered a problem which type I cannot identify. The Manual, on p. 72, mentions Ubuntu One in the context of the Evolution address book, yet Ubuntu One itself is not explained fully until p. 98. It is rather jarring to suddenly see Ubuntu One mentioned with no definition. At the very least, I believe a note needs to be put in the "sidebar" referring the user to p. 98 to learn more about Ubuntu One.