diff --git a/mkdocs.yml b/mkdocs.yml
index e5c3123..06650d7 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -88,7 +88,7 @@ markdown_extensions:
   - pymdownx.superfences
   - attr_list
   - toc:
-    permalink: true
+      permalink: true
   - pymdownx.emoji:
       emoji_index:  !!python/name:materialx.emoji.twemoji
       emoji_generator:  !!python/name:materialx.emoji.to_svg