I came here to post the same suggestion.
There is a quick explanation on page 5 under the Game Conventions section (which is good), but this is the first detailed description that we get--which makes sense as character creation is the first place where it's used extensively.
However, like Venomous suggested, these details might be better placed earlier--perhaps after the characteristics section? The main issue is that pages 14 and 15 use the EDU 7+ or INT 7+ convention extensively and these pages come before page 16, where the detailed explanation of the convention is now.