The Humanoid trait Knowledge Focus (p21) costs 2 points, is a class-only trait, and increases the maximum traits by 1.
Is this just the most useless trait ever (since you buy a trait, taking up a trait slot, to increase the max traits by 1); did I misunderstand something cool about this; is the class-only a typo, and should it be species-only; or is there something else going on here?
You are looking in the old file xD in the errata the trait was rewritten to 'species trait only'