Weapon Finesse

Type: General, Fighter
Source: Player's Handbook

You are especially skilled at using a certain weapon, one that can benefit as much from Dexterity as from Strength. Choose one light weapon.
Prerequisite: base attack bonus +1
Benefit: With a light weapon, rapier, whip, or spiked chain made for a creature your size, you may use your Dexterity modifier instead of your Strength modifier on attack rolls. If you carry a shield, the shield's armor check penalty apply to your attack rolls.
Special: Natural weapons are always considered light weapons.