[racket] Making a section optional in Scribble

Is there an easy way to include / exclude a section based on a flag?

E.g. In the following example, I want to include section two for some folk,
but not for others.

#lang scribble/base

@section{Section one}

Section one is for everyone.

@(when some-condition

   @section{Section two}

   "Section two is for some, but not all.")



I've tried splitting section two into a second file and conditionally
including it, but that caused level confusion.


Thanks

Dan
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