Mark Zuckerberg and his wife Pricilla Chan are expecting a second daughter!

The social media tycoon made the announcement on his website today: “When Priscilla and I first found out she was pregnant again, our first hope was that the child would be healthy,” he wrote. “My next hope was that it would be a girl. I cannot think of a greater gift than having a sister and I’m so happy Max and our new child will have each other.”

Mark and Pricilla already have a 1-year-old daughter named Max. So baby number two is sure to grow up side-by-side with her — how cute is that!

Pricilla suffered from three miscarriages before giving birth to Max, so to be expecting another daughter is true blessing.

Read Mark’s sweet post about the power of sisterhood: