What does 1 Chronicles 29:22 mean?

They ate and drank together with great joy in God’s presence that day. Then, for a second time, they made Solomon, David’s son, king. They anointed him as ruler for the Lord, and Zadok as priest. 1 Chronicles 29:22 - Modern Text Bible

(It’s a big celebration—Solomon is officially made king again, and Zadok is confirmed as priest.)