That's cool of Lucas to do that. I'm surprised he would recognize anyone giving him any help on anything though, he's always saying that Star Wars was (and is) his in every way, and to an extent, he even basically says that he did everything on them. Watch Empire of Dreams. People like Lawrence Kasdan are never even mentioned. It's just "when I was writing the script to Empire Strikes Back..." or something like that. They say he had a lot more jobs on the films than he actually had.

But anyway, that's a nice thing to do.