diff --git a/language-snippets.ent b/language-snippets.ent
index 030094931b..77bde59b74 100644
--- a/language-snippets.ent
+++ b/language-snippets.ent
@@ -246,3 +246,6 @@ are <emphasis>case-sensitive</emphasis></simpara></note>'>
 <!-- Notes for tidy -->
 <!ENTITY note.tidy.ze2 '<note><simpara> This function is only available with Zend Engine 2, this means PHP
 &gt;= 5.0.0.</simpara></note>'>
+
+<!ENTITY note.tidy.1only '<note><simpara>This function is only avaliable in
+Tidy 1.0. It became obsolete in Tidy 2.0 and thus has been removed.</simpara></note>'>