diff --git a/docs/source/conf.py b/docs/source/conf.py
index abf4498a..d08421f8 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -18,6 +18,7 @@
     "sphinx.ext.autosummary",
     "sphinx.ext.intersphinx",
     "sphinx.ext.autosectionlabel",
+    "sphinx_rtd_theme",
 ]
 
 intersphinx_mapping = {