Skillful (3.5e Equipment)
From D&D Wiki
Skillful: A skillful weapon increases the damage die of the enchanted weapon by one step. IE: 1d6 to 1d8
For simple light weapons, the price may be treated as a +1 bonus, although all other requirements remain the same.
CL 5; Craft Magic Arms and Armor, proficiency with weapon; Market Price: +1 bonus