What does Athena instruct Odysseus he must tell telemachus?

Athena instructs Odysseus that he must tell Telemachus his story.

She said to Odysseus: "High-born son of Laertes, ready Odysseus, tell now your story to your son. Hide it no longer. Then having planned the suitors' death and doom, go forward both of you into the famous city. And I myself will not be far away, for I am eager for the combat."