What does 1 Samuel 3:8 mean?

The Lord called Samuel a third time. Samuel got up, went to Eli, and said, 'Here I am. You called me.' That’s when Eli finally realized the Lord was calling the boy. 1 Samuel 3:8 - Modern Text Bible

(After three times, Eli figures out that it’s God, not him, calling Samuel. This is a turning point for both of them.)