What does 2 Samuel 21:19 mean?

In another fight at Gob, Elhanan son of Jaare-oregim from Bethlehem killed Goliath's brother, whose spear was like a weaver's beam. 2 Samuel 21:19 - Modern Text Bible

(Elhanan kills another giant, related to Goliath, showing the ongoing struggle and victories over Israel's enemies.)