Whoever, or whatever, is creating the thing that needs reference materials would have to seed the initial set (just as they/it seeded the thing itself) and then go from there.

If you didn't, then you won't be included the training set (obviously) and the AI would not easily know about you. Sort of how if you start a really cool company but don't make a website Google doesn't know about you and can't return you in their search results. It's valuable for Google (AI) to know about you, so it's valuable to build the sites (docs) to get indexed (trained on).