diff --git a/mkdocs.yml b/mkdocs.yml
index 30fd5bb..1452a7b 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -61,3 +61,5 @@ markdown_extensions:
         - name: mermaid
           class: mermaid
           format: "!!python/name:pymdownx.superfences.fence_code_format"
+  - toc:
+      toc_depth: 3
\ No newline at end of file