What does 2 Chronicles 29:12 mean?

Then the Levites got to work. From the Kohathites: Mahath son of Amasai and Joel son of Azariah. From the Merarites: Kish son of Abdi and Azariah son of Jehallelel. From the Gershonites: Joah son of Zimmah and Eden son of Joah. 2 Chronicles 29:12 - Modern Text Bible

(Specific Levite leaders from each clan step forward, showing the community’s willingness to respond to Hezekiah’s call.)