Complementary Insight
(Races of Destiny, page 150, DnD 3.5)
[Racial]
You get more out of having skills that work well together.
Prerequisite
Half-elf
Benefit
Having 5 or more ranks in a skill gives you a +3 bonus on skill checks with each of its synergistic skills, as noted in the skill description.
Normal
Synergistic skills provide a +2 bonus on skill checks.