What does 1 Kings 15:29 mean?

As soon as he became king, Baasha killed everyone in Jeroboam’s family. He didn’t leave anyone alive, just as the Lord had said through his servant Ahijah from Shiloh. 1 Kings 15:29 - Modern Text Bible

(Baasha wiped out Jeroboam’s entire family, fulfilling a prophecy about their downfall.)