You are skilled at using ranged weapons while mounted.
Prerequisites: Ride 1 rank, Mounted Combat.
Benefit: The penalty you take when using a ranged weapon while mounted is halved: -2 instead of -4 if your mount is taking a double move, and -4 instead of -8 if your mount is running.
Special: A Fighter may select Mounted Archery as one of his fighter bonus feats.
Source: Player’s Handbook (Page 98)