You are trained in using your agility in melee Combat, as opposed to brute Strength.

Benefit: With a light weapon, elven curve blade, Rapier, whip, or spiked chain made for a Creature of your size category, you may use your Dexterity modifier instead of your Strength modifier on attack rolls. If you carry a Shield, its armor check Penalty applies to your attack rolls.

Special: Natural Weapons are considered light Weapons.