I'm not so sure about that. A request for more information can be incredibly important (for instance: Tell me who committed the murder! also see: stubs on Wikipedia). Essentially, there is a point of diminishing returns, and after a while, possibly negative returns as the work becomes too hard to assimilate.

However, in this case, I tend to think that Zed included just enough information to get someone who's clueless started - he even included references at the end so that if you DO want more, you can easily get it.