diff --git a/index.html b/index.html
index 6c18210..81117e5 100644
--- a/index.html
+++ b/index.html
@@ -2,6 +2,9 @@
 <html lang="en-us">
 
 <head>
+  <!-- MathJax CDN -->
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
+  <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
 </head>
 
 <body>
