Bow Sniper (3.5e Feat)
From D&D Wiki
 Bow Sniper [General]
You are skilled at using a bow to strike vulnerable spots
Prerequisite: Far Shot, +1 Base attack bonus
Benefit: You add half your Dexterity modifier to your damage roll when making attacks with a bow. If you have the skirmish or sneak attack ability the maximum range you make such attacks increases to 60ft.
Normal: Normally you would gain no damage bonus from your Dex modifier.
Note: Prerequisite for Improved Bow Sniper