Maximum dexterity bonus

Most armors and shields have a maximum dexterity bonus. This means your dexterity bonus to AC cannot be higher than what your armor or shield allows.

For example a character with 14 dexterity gains +2 AC when wearing no armor, however if her armor has a maximum dexterity bonus of +1 (e.g. Full plate) she would only gain +1 AC of dexterity bonus to armor class.