Mark Zuckerberg, 32, and wife Priscilla Chan are expecting a second child, a daughter, sister to 15-months-old, Max. The Facebook founder announced the news on Thursday in the social network. It came on the same day that Facebook shares hit an all-time of $138.57.

Here is the full announcement:

Priscilla and I are happy to share we’re expecting another baby girl!

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After our difficult experience having Max, we weren’t sure what to expect or whether we’d be able to have another child. When Priscilla and I first found out she was pregnant again, our first hope was that the child would be healthy. 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.

I grew up with three sisters and they taught me to learn from smart, strong women. They weren’t just my sisters but some of my best friends. They’ve gone on to write books, excel at performance, music, sports, cooking and their careers. They showed me how to compete and still laugh together afterwards.

In 2015, when Max was born, the Zuckerbergs pledged to put 99 percent of his Facebook shares into a new philanthropy project focusing on human potential and equality. According to Forbes, Zuckerberg has a net worth of $57.8 billion.