Question regarding daemon weapons

By Nidding, in Black Crusade

So i fail at using the search function and im apparently blind when reading the rulebook. In the section about daemon weapons they mention binding strength as a factor when determining number of abilities. I can't find anywhere explaining this in the book, so my question is... what page? =)

Sorry about any spelling/grammatical errors, my english is not as good as it should be... and thanks in advance for any answers

Pg. 200-201, in the section describing the ritual for binding the daemon.

Thank you, that line completely eluded me =)