diff --git a/mkdocs.yml b/mkdocs.yml
index 54752da8..74cdc40b 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -3,3 +3,4 @@ theme: readthedocs
 markdown_extensions:
   - toc:
       permalink: yes
+      toc_depth: '1-4'