What does 2 Kings 23:31 mean?

Jehoahaz was twenty-three when he became king, and he ruled in Jerusalem for three years. His mother was Hamutal, daughter of Jeremiah from Libnah. 2 Kings 23:31 - Modern Text Bible

(Jehoahaz was young and only ruled for a short time. His mother’s background is mentioned, which was common for royal records.)