Wrong documentation string for "IF" special operator

[YP]

When I type:
  (documentation 'if 'function)

it returns this:
  "IF predicate then [else]

  If PREDICATE evaluates to false, evaluate THEN and return its values,
  otherwise evaluate ELSE and return its values. ELSE defaults to NIL."

it should return:
  "IF predicate then [else]

  If PREDICATE evaluates to true, evaluate THEN and return its values,
------------------------------------^^^^^
  otherwise evaluate ELSE and return its values. ELSE defaults to NIL."

Additional info:
$ sbcl --version
SBCL 1.0.30

$ uname -a
Linux gis 2.6.28-15-generic #49-Ubuntu SMP Tue Aug 18 18:40:08 UTC 2009 i686 GNU/Linux