Jonathan Demme?

Does anyone know why Jonathan Demme is assigned a writing credit for this film in the IMDb?

I've looked at the opening and closing credits on YouTube and the only writing credit is for "Rob Morton." This is a pseudonym for Nancy Dowd, who would later work with Demme on "Swing Shift" (also under the pseudonym "Rob Morton").

In the "making of" documentary for "Fabulous Stains" (also on YouTube), Dowd is interviewed, but Demme is never mentioned.