package descriptive text and lm-commentary

[Willem Rein Oudshoorn]

Yesterday I created my first package, a single .el file.
Today I noticed that the description of the package, as shown in emacs
and on marmalade, lookes like:

   ;;; Commentary:

   ;; Text bla etce...


Including the ;;'s.  Other packages do not have the ;; prefixed.
It seems that this is caused by lm-commentary returning the whole
commentary section and not stripping of the ';;'.  

Is this expected behaviour of

1 - lm-commentary
2 - Single file package descriptions?

And how can I fix this?  I assume by making it into a tar.gz package?

Kind regards,
Wim Oudshoorn.

P.S.: If any one interested, it is the package sparkline.el on
marmalade.