Improved Critical

Improved Critical
You can make devastating attacks with your chosen weapon.
Prerequsites: BAB +6
Benefit: Whenever you attack with a weapon of the chosen weapon type, the critical range of the attack is increased by 1. Thus, if a weapon scores a critical hit on a natural 20, it can score a critical hit on a natural roll of 19 or 20 instead. However, any roll other than a natural 20 is not considered an automatic hit; if you roll a natural 19 and miss the target, you do not score a critical hit.
Normal:
Special: