What does 1 Chronicles 9:19 mean?

Shallum son of Kore, son of Ebiasaph, son of Korah, and his relatives from his family, the Korahites, were responsible for guarding the entrances to the tent, just as their ancestors had guarded the entrance to the Lord's camp. 1 Chronicles 9:19 - Modern Text Bible

(Shallum and his family, the Korahites, had a special role in guarding the entrances to the temple, continuing a tradition that went back to the time of Moses.)