diff --git a/documentation/conf.py b/documentation/conf.py
index 48d28a686..7144d6db1 100644
--- a/documentation/conf.py
+++ b/documentation/conf.py
@@ -48,6 +48,7 @@ needs_sphinx = "4.0"
 extensions = [
     'sphinx.ext.autosectionlabel',
     'sphinx.ext.extlinks',
+    'sphinx.ext.graphviz',
     'sphinx.ext.intersphinx',
     'sphinx_copybutton',
     'sphinxcontrib.rsvgconverter',