diff --git a/django/template/smartif.py b/django/template/smartif.py
index 0a917c2aaa4b..6a6a03dd84c6 100644
--- a/django/template/smartif.py
+++ b/django/template/smartif.py
@@ -3,7 +3,7 @@
 """
 
 # Using a simple top down parser, as described here:
-#    http://effbot.org/zone/simple-top-down-parsing.htm.
+#    https://11l-lang.org/archive/simple-top-down-parsing/
 # 'led' = left denotation
 # 'nud' = null denotation
 # 'bp' = binding power (left = lbp, right = rbp)