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. This agile combat style also provides you with greater damage than you'd expect from strength alone, use half of your dexterity modifier (rounded down) instead your strength modifier (or whichever is higher) for damage rolls.
Special: Natural weapons and touch attacks are considered light weapons.