What does Jeremiah 45:1 mean?

This is the message Jeremiah gave to Baruch son of Neriah, when Baruch wrote down Jeremiah’s words in a scroll during Jehoiakim’s fourth year as king of Judah. Jeremiah 45:1 - Modern Text Bible

(This sets the scene: Jeremiah’s scribe Baruch receives a personal message from God during a time of national crisis.)