diff -ru ../kitchen-1.2.6.orig/kitchen3/docs/conf.py ./kitchen3/docs/conf.py
--- ../kitchen-1.2.6.orig/kitchen3/docs/conf.py	2019-05-14 14:51:05.000000000 -0500
+++ ./kitchen3/docs/conf.py	2020-08-19 16:39:01.246258880 -0500
@@ -25,7 +25,7 @@
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ['sphinx.ext.autodoc', 'sphinx.ext.doctest', 'sphinx.ext.intersphinx', 'sphinx.ext.todo', 'sphinx.ext.coverage', 'sphinx.ext.pngmath', 'sphinx.ext.ifconfig']
+extensions = ['sphinx.ext.autodoc', 'sphinx.ext.doctest', 'sphinx.ext.intersphinx', 'sphinx.ext.todo', 'sphinx.ext.coverage', 'sphinx.ext.imgmath', 'sphinx.ext.ifconfig']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']