References

This is also a good place for plot hooks, rumors, a common knowledge for your players. Remember they don't spend nearly as much time as the GM preparing for the game, reading the source material, or memorizing the story lines.
Remember, reading these snippets of data can really help players immerse themselves in the game.

This is a more detailed explanation. Notice how this also links to other references to NPCs, locations, legends. Neat, huh?