Question about formatting writing credits - Morocco (1930) and the "play" Amy Jolly

An unusual problem has arisen with the writing credits for the 1930 film Morocco. There is a credit that reads "from the play "Amy Jolly" by Benno Vigny." This is an accurate representation of the screen credits, but the filmmakers themselves apparently made a mistake, as Vigny's story was written as a novel, not a play.

Is there a correct and proper way to clarify this on IMDb that will accurately represent the screen credits while also making it clear that the film was in fact based on a novel, rather than a play? I haven't found anything in IMDb's crew credit guidelines that clarifies how to deal with this sort of situation.