; We make single line comments by writing out text after a semicolon

#| We make
block comments
like this |#

#;(define (commented-out-function x)
    (print (string-append "This entire "
            "s-expression is commented out!")))

When a module is using at expressions, such as:

#lang at-exp racket/base

or

#lang scribble/manual

You have access to the following types of comments:

@;{Block text that goes
   until the closing
   brace.}

As well as:

@; Single line text.

Note that if you are using a language that only uses at-exps (such as most scribble languages), you will need ot use one of these types of comments.