I don't have the art skills to draw a picture of what this looks like, so I'm going to do my best to describe it in words.
I'm looking in measure 40 of the J'eux d'Eau (give or take a few measures, of course). The right hand has 32nd notes, and the left hand has chords. On one of these chords, there is a B on top, and an E natural on the bottom, with a line drawn from the B down to an additional note--an E sharp.
I have two versions of this piece, and both have this in them, and I'm at a complete loss as to how to play it.
Help?