PHILADELPHIA (CBS) — Mark Zuckerberg and his wife have welcomed another daughter into the world.

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Zuckerberg announced on Facebook his wife, Priscilla Chan, recently gave birth to their daughter August.

“Childhood is magical. You only get to be a child once, so don’t spend it worrying too much about the future. You’ve got us for that, and we’ll do everything we possibly can to make sure the world is a better place for you and all children in your generation,” Zuckerberg wrote in a letter to his new daughter.

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Their first daughter, Max, was born in November 2015.

The Facebook CEO is taking two months paternity leave with August’s birth.