What does Jeremiah 51:59 mean?

This is the message Jeremiah gave to Seraiah, son of Neriah and grandson of Mahseiah, when Seraiah went with King Zedekiah of Judah to Babylon in the fourth year of Zedekiah’s reign. Seraiah was the king’s chief officer. Jeremiah 51:59 - Modern Text Bible

(Jeremiah hands a message to Seraiah, who is traveling with King Zedekiah to Babylon. Seraiah holds an important position in the king’s court.)