What does 2 Kings 24:18 mean?

Zedekiah was twenty-one when he became king, and he ruled in Jerusalem for eleven years. His mom was Hamutal, daughter of Jeremiah from Libnah. 2 Kings 24:18 - Modern Text Bible

(This verse introduces Zedekiah, the last king of Judah, and gives his age, how long he ruled, and his family background.)