What does Nehemiah 3:16 mean?

After him, Nehemiah, son of Azbuk, who was in charge of half the district of Beth-zur, repaired the wall up to a point across from the tombs of David, as far as the artificial pool and the army barracks. Nehemiah 3:16 - Modern Text Bible

(This part of the wall was near historic and strategic sites, showing the importance of the work.)