checklink: HTML 3.2 not recognised.

I would like to validate subsites containing pages in HTML 3.2.
The on-line service says it doesn't know about HTML 3.2.
"the Document Type (-//W3C//DTD HTML 3.2//EN) is not in the  
validator's catalog"
The text at the Documentation link does not say how to add new
(old) DTDs to the catalog.

--
"I don't want to discuss evidence." -- Richard Dawkins, in an
interview with Rupert Sheldrake.  (Fortean times 232, p55.)