Newbie query about rd2

Suppose I have the RD format stuff below in file z.rb.

=begin
I want this to be paragraph 1.

I want this to be paragraph 2.
=end

Using: rd2 -rrd/rd2html-lib.rb z.rb > z.html; lynx z.html
I get 2 paragraphs much as in the input.

Using: rd2 -rrd/rd2man-lib.rb z.rb > z.1; man -l z.1
I get a single paragraph containing 2 sentences.

How can I get 2 paragraphs for manpage output?

Barrie.