I'm with Drilnoth here; this is clearly at least as notable as any of the other D&D; modules, each of which has their own page.  This one has the additional notability of (1) being about an iconic D&D; character and furthering its plot, (2) being one of the few modules that takes place across multiple campaign worlds, and (3) being the last officially released module for 2nd Edition (which I realise isn't mentioned in the article - this is my understanding, but I can't find citation for it right now).  Notability warning should be removed.