What does Genesis 37:2 mean?

Here’s the story of Jacob’s family: Joseph, at seventeen, was out with his brothers, helping take care of the sheep. He was with the sons of Bilhah and Zilpah, his father’s other wives. Joseph brought back a bad report about his brothers to their father. Genesis 37:2 - Modern Text Bible

(This introduces Joseph and hints at tension, since he tells on his brothers, which will affect their relationship.)