diff --git a/docs/conf.py b/docs/conf.py
index 04172441..5a5b5eed 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -21,6 +21,7 @@ extensions = [
     'sphinx.ext.autodoc',
     'sphinx.ext.intersphinx',
     'sphinxcontrib.log_cabinet',
+    'pallets_sphinx_themes',
 ]
 
 intersphinx_mapping = {