diff --git a/README.txt b/README.txt
index aeb6ca5..3238886 100644
--- a/README.txt
+++ b/README.txt
@@ -37,8 +37,9 @@ The hosts which produce production quality is:
 Host Setup
 ----------
 
-HTML builds directly with Sphinx, PDF requires a full Latex (texlive) install,
-and building a Single HTML page requires the 'inliner' tool. The
+For HTML output a Sphinx and a full Latex (texlive) installation is necessary.
+Sphinx uses Latex to produce images of mathematical formulas for the HTML
+output.  Building a Single HTML page requires the 'inliner' tool. The
 sphinxcontrib-bibtex extension is mandatory.
 
 Please add your host as you set it up.