diff --git a/docs/conf.py b/docs/conf.py
index 2cdc8dd..a071892 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -18,7 +18,11 @@ author = 'Sakuragasaki46'
 # -- General configuration ---------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
 
-extensions = ["sphinx.ext.autodoc", 'sphinx.ext.autosummary']
+extensions = [
+    "sphinx.ext.autodoc", 
+    'sphinx.ext.autosummary',
+    'sphinx_rtd_theme'
+]
 
 templates_path = ['_templates']
 exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']