Adam Clarke on 2 Chronicles 27:7

The rest of the acts of Jotham, and all his wars, and his ways - It was in his days, according to 2Kgs 15:37, that Rezin king of Syria, and Pekah king of Israel, began to cut Judah short. See the notes on 2Kgs 15:36, 2Kgs 15:37.

Written in the book of the kings, etc. - There is not so much found in the books of Kings which we have now, as in this place of the Chronicles. In both places we have abridged accounts only: the larger histories have long been lost. The reign of Jotham was properly the last politically prosperous reign among the Jews. Hezekiah and Josiah did much to preserve the Divine worship; but Judah continued to be cut short, till at last it was wholly ruined.