diff --git a/README.txt b/README.txt
index 3238886..aeb6ca5 100644
--- a/README.txt
+++ b/README.txt
@@ -37,9 +37,8 @@ The hosts which produce production quality is:
 Host Setup
 ----------
 
-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
+HTML builds directly with Sphinx, PDF requires a full Latex (texlive) install,
+and building a Single HTML page requires the 'inliner' tool. The
 sphinxcontrib-bibtex extension is mandatory.
 
 Please add your host as you set it up.
diff --git a/c-user/conf.py b/c-user/conf.py
index 0afe6f8..18b3206 100644
--- a/c-user/conf.py
+++ b/c-user/conf.py
@@ -3,7 +3,7 @@ sys.path.append(os.path.abspath('../common/'))
 
 from conf import *
 
-extensions = ['sphinx.ext.imgmath', 'sphinxcontrib.bibtex']
+extensions = ['sphinx.ext.mathjax', 'sphinxcontrib.bibtex']
 
 version = '4.11.99'
 release = '4.11.99'