Welp, I guess you were right, it does say improves stealth slightly while stealthed as a Rogue or prowling as a Druid. However, how much is that increase? Is it really noticable (as in, is it as noticable as a whole 1 point into Master of Deception) or is it just a placebo effect?
On a side note, hey, this is the first thread I've ever started on these boards! :D