A character may opt to make a close combar attack at an additional -2 modifier. If this attack causes any wound, the victim has to make a stun roll in addition to all the regular effects of the wound. If the attack was also a called shot, the attacker may decide – before determining the damage caused – to apply the called shot damage modifier to this potential stun roll instead of the damage rating.
Little Rules are these tiny bits and pieces that just seem to creep up naturally as a game goes on and players dive in. Not the big changes or additions, the little ones.