[racket] #lang scheme vrs #lang racket in libraries

I'm working on updating a racket library that someone else wrote and hope
to make it into a planet package. I've noticed that several of the planet
packages (and the code that I am working on) start out with #lang scheme
and then (require racket), which to me looks like the same thing as just
doing #lang racket. Have I missed something? Is there a reason to use
#lang scheme if you are just going to (require racket) on the next line?

Shalom,
Jordan