What does 1 Kings 16:17 mean?

Now the rest of the acts of Elah, and all that he did, aren’t they written in the book of the chronicles of the kings of Israel?

In the twenty-seventh year of Asa king of Judah, Zimri reigned seven days in Tirzah. Now the people were encamped against Gibbethon, which belonged to the Philistines.

The people who were encamped heard that Zimri had conspired, and had also killed the king. Therefore all Israel made Omri, the captain of the army, king over Israel that day in the camp.

When Zimri saw that the city was taken, he went into the fortified part of the king’s house, and burned the king’s house over him with fire, and died,

for his sins which he sinned in doing that which was evil in Yahweh’s sight, in walking in the way of Jeroboam, and in his sin which he did, to make Israel to sin.

Now the rest of the acts of Zimri, and his treason that he committed, aren’t they written in the book of the chronicles of the kings of Israel?