diff --git a/bin/html.sed b/bin/html.sed
index f54c80bde..1fcc8eca7 100644
--- a/bin/html.sed
+++ b/bin/html.sed
@@ -16,7 +16,7 @@
 #
 # For a list of the other HTML entities, should others be needed, see:
 #
-#       https://www.w3schools.com/html/html_entities.asp
+#       https://www.webnots.com/using-symbols-and-special-characters-in-html/
 #
 # usage:
 #