specifying markdown provider

[notEthan]

rubydoc.info doesn't seem to be using the ---markup-provider in my .yardopts. I think it is intended that it should (appears that way flipping through the source), though I could be wrong. It seems to always use redcarpet, regardless of setting provider to any other value (tried commonmarker, maruku, kramdown, rdiscount). My .yardopts follows, am I doing something wrong with it?

--main README.md
--markup=markdown
--markup-provider=commonmarker
--no-private
--hide-void-return
-
docs/**/*.md
{lib}/**/*.rb