diff --git a/sphinx/ext/mathjax.py b/sphinx/ext/mathjax.py
index 24109ee98..ccb70ec57 100644
--- a/sphinx/ext/mathjax.py
+++ b/sphinx/ext/mathjax.py
@@ -25,7 +25,7 @@ if TYPE_CHECKING:
     from sphinx.writers.html import HTML5Translator
 
 # more information for mathjax secure url is here:
-# https://docs.mathjax.org/en/latest/start.html#secure-access-to-the-cdn
+# https://docs.mathjax.org/en/latest/web/start.html#using-mathjax-from-a-content-delivery-network-cdn
 MATHJAX_URL = 'https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js'
 
 logger = sphinx.util.logging.getLogger(__name__)