diff --git a/Doc/source/conf.py b/Doc/source/conf.py
index e0ee7a936..82a5d5799 100644
--- a/Doc/source/conf.py
+++ b/Doc/source/conf.py
@@ -30,7 +30,7 @@ needs_sphinx = "1.3"
 # 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.viewcode", "sphinx.ext.napoleon"]
+extensions = ["sphinx.ext.autodoc", "sphinx.ext.viewcode", "sphinx.ext.napoleon", "sphinx.ext.coverage"]
 
 autodoc_mock_imports = ["gtk"]