Write Back Photos isn't a write?

Me again, fiddling EXIF data… I’m trying to read the photos from my iPhoto library, run the Fix EXIF Rotation node, and then put the fixed images back into iPhoto. Simple three node workflow. When I try to run it on a small test album, though, it gives the error saying I don’t have a write node. Write Back Photos isn’t a write? Or do I not understand what the write back node is supposed to do?

I’ve got this fixed for the next release, which you can grab a preview of from here: https://flyingmeat.com/download/latest/#retrobatch