Doc: add extension for Graphviz

diff --git a/doc/source/conf.py b/doc/source/conf.py
index c9184a6899eb2a80a93a155146bc4c6b4d312a4c..bd7d3d8ae0ba7f5310cc2457f28da93940e7cdb4 100644 (file)
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -26,7 +26,9 @@ sys.path.insert(0, os.path.abspath('../../'))
 
 # 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.coverage', 'sphinx.ext.viewcode', 'sphinx.ext.autosummary', 'sphinx.ext.doctest', 'numpydoc']
+extensions = ['sphinx.ext.autodoc', 'sphinx.ext.coverage',
+              'sphinx.ext.viewcode', 'sphinx.ext.autosummary',
+              'sphinx.ext.doctest', 'numpydoc', 'sphinx.ext.graphviz']
 
 doctest_path = os.path.abspath('../../')
 doctest_global_setup = '''