Mounted Archery [General]
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 (see Mounted Combat, page 157).
Special: A fighter may select Mounted Archery as one of his fighter bonus feats (see page 38).
Source: Player's Handbook