fields appearing in cran descriptions pages

Tue, Oct 31, 2006 5:16 PM #

What determines which fields appear in CRAN descriptions pages.
For example, for doBy there is no Date: but there is a vignette listed:

   http://cran.r-project.org/src/contrib/Descriptions/doBy.html

whereas for gsubfn there is a Date: but there is no vignette listed
(even though it has one).

  http://cran.r-project.org/src/contrib/Descriptions/gsubfn.html