[racket] SRFI-34's guard

Hello.

I'd like to use SRFI-34 on Racket, but it says else is not allowed
eventhough I copied and paseted sample codes stated in SRFI-34.

> (require srfi/34)
> (guard (condition
         (else
          (display "condition: ")
          (write condition)
          (newline)
          'exception))
  (+ 1 (raise 'an-error)))
. else: not allowed as an expression in: else
> (guard (condition
         (else
          (display "something went wrong")
          (newline)
          'dont-care))
 (+ 1 (raise 'an-error)))
. else: not allowed as an expression in: else
>

Is there any reason I couldn't use 'else'?

Thanx.
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