diff --git a/docs/source/conf.py b/docs/source/conf.py
index 8020ecb..329ce3e 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -60,3 +60,6 @@ html_theme_options = {
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
+
+# https://stackoverflow.com/a/56448499
+master_doc = 'index'