Forum:Room of Requirement

... i'm just wondering: where in the fourth book (Harry potter and the goblet of fire) did dumbledore mention the room of requirement...? i'm re-reading all of my HP books, and i'm now in the fifth book, and Harry said something in there that says Dumbledore kind of mentioned the Room of Requirement... i can't seem to find it in the goblet of fire, though.... can someone answer this please... because it's puzzling me for days now.... (call me crazy, haha) :-D

---'brey---