Shield Specialization

 
Prerequisite(s): Proficiency with Shields.
 
Benefit: Choose one type of shield from the following list: buckler, heavy, or light. When using a shield of the appropriate type, you increase its shield bonus to AC by 1.
 
Special: You can take this feat more than once. Each time you select it, choose a different type of shield. A fighter can select Shield Specialization as one of his fighter bonus feats
 
Source: PHB II