Sphinx on Windows

[Simon Peyton Jones]

The GHC wiki says you need Sphinx to build docs,
            https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Tools
and refers to the Preparation doc for how to install Sphinx
https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation
But the Windows sub-page of Preparation does not say how to install Sphinx.
Question: how does one install Sphinx on Windows?  The sphinx-doc home page mutters about 'pip', but I've never used that.  Does anyone have instructions?
Thanks
Simon
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