diff --git a/docs/mkdocs.yml b/docs/mkdocs.yml
index 32dd94a3b..8c8fbca51 100644
--- a/docs/mkdocs.yml
+++ b/docs/mkdocs.yml
@@ -120,11 +120,11 @@ extra:
 markdown_extensions:
   - toc:
       permalink: true
-	  - pymdownx.arithmatex:
+  - pymdownx.arithmatex:
       generic: true
       block_tag: 'pre'
 
 extra_javascript:
     - ./assets/mathjax.js
     - https://polyfill.io/v3/polyfill.min.js?features=es6
-    - https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js
\ No newline at end of file
+    - https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js