What does 1 Chronicles 12:9 mean?

Ezer was their leader, followed by Obadiah, Eliab, Mishmannah, Jeremiah, Attai, Eliel, Johanan, Elzabad, Jeremiah, and Machbannai. 1 Chronicles 12:9 - Modern Text Bible

(The names of the Gadite leaders are listed, showing the strength and organization of David's growing support.)