pg 94, M-Toc Mastery
: In order to take this quality, you
must have the Small Unit Tactics knowledge
skill and an M-TOC (p. 86 and 89-90, Firing
Squad). Add one to the maximum number of
Edge that can be stored using your M-TOC.
If you add an M-TOC specialization to
your Small Unit Tactics knowledge skill,
increase the max Edge storage by two. The
bonus increases to three if you upgrade the
specialization to an expertise.
Knowledge skills in 6th edition don't have specializations or expertise. Please, please, authors of 6th edition rules, please learn the rules of 6th edition.