Source: Unearthed Arcana 39 - Feats for Races

Prerequisite: Half-elf

You develop your magnetic personality to ease your way through the world. You gain the following benefits:

• Increase your Charisma score by 1, up to a maximum of 20.

• You gain proficiency in Deception and Persuasion skills. If you're already proficient in either skill, your proficiency bonus is doubled for any check you make with that skill.