Because it just starts there. One sentence turns into 5 sentences turns into 10 and so on until you've added many pages. Not just about this but about this and more that seems unclear because FFG decided to leave some things to GM discretion and common sense.
"It seemed to me," said Wonko the Sane, "that any civilization that had so far lost it's head as to need to include a set of detailed instructions for use in a package of toothpicks, was no longer a civilization in which I could live and stay sane."
10 Points for the Hitchhiker reference.