diff --git a/mkdocs.yml b/mkdocs.yml
index 7aeea9c..fcb5d1b 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -21,6 +21,7 @@ theme:
   features:
     - navigation.top
     - navigation.instant
+    - navigation.indexes
     - search.suggest
     - search.highlight
     - search.share