bug#9819: 24.0.50; Docstring of `define-minor-mode' and KEYMAP

[Deniz Dogan <deniz@dogan.se>]

I read in the docstring of `define-minor-mode':

<quote>
Optional KEYMAP is the default keymap bound to the mode keymap.
  If non-nil, it should be a variable name (whose value is a keymap),
  or an expression that returns either a keymap or a list of
  arguments for `easy-mmode-define-keymap'.  If KEYMAP is not a symbol,
  this also defines the variable MODE-map.

  [...]

:keymap MAP	Same as the KEYMAP argument.
</quote>

The way I interpret that is: if I don't pass a KEYMAP argument, it will
define a variable named `MODE-map'.  However, this doesn't happen when I
use this code:

<quote>
(define-minor-mode helo-track-minor-mode
  "Global minor mode for tracking activity in helo buffers."
  :init-value nil
  :lighter ""
  :global t
  :group 'helo
  [...]
</quote>

Am I misunderstanding the docstring or is this a bug?

Deniz