Yep. It's a very common problem with RPGs - they're big, complex books intended for heavy referencing, and yet they're far too frequently saddled with bad (or even non-existent) indexing.
My particular pet peeve is those RPG books that have an index that isn't placed right at the back of the book - they have the index and then some number of pages of summarised rules. Where both the index and the summaries are good things, but by placing them in the wrong order they make them both suck.
(All that said, what we should really have, now we're in the 21st century, is an online database of everything, all properly hyperlinked together and searchable for easy reference.)