Pathfinder APG no -4 penalty for Double Crossbow

Equipped the PC with a Double Crossbow. The PC is incurring the standard -4 for not being proficient however, "Due to its size and weight, you take a -4 penalty on your attack rolls if you're proficient with it, or -8 if you're not." [APG p. 176] Should have a -8 penalty.

It looks like the weapon entry needs a BONUS:WEAPON|TOHIT|-4 tag in it