Improved Thunderclap

From wow.incgamers.com

Talent: Improved Thunderclap
Effect: Reduces the cost of your Thunder Clap ability by rage points and increases the damage by a % and the slowing effect by an additional %.
Statistics: Rank 1 = -1 rage point, +40% Damage and +4% slowing effect, Rank 2 = -2 rage point, +70% Damage and +7% slowing effect, Rank 3 = -4 rage point, +100% Damage and +10% slowing effect.