diff --git a/conf.py b/conf.py
index 167c4edff7265b73eab7fcaf2c70ba334e62b492..8874b65af80640ea70b3b36903e25d5d14e50a65 100644
--- a/conf.py
+++ b/conf.py
@@ -33,7 +33,7 @@ release = version
 # 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_tabs.tabs']
+extensions = ['sphinx_tabs.tabs', 'sphinxcontrib.plantuml']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']