diff --git a/appendices/tokens.xml b/appendices/tokens.xml
index e27ca1bafc..5a83aaa9de 100644
--- a/appendices/tokens.xml
+++ b/appendices/tokens.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.29 $ -->
+<!-- $Revision: 1.30 $ -->
 
 <appendix xml:id="tokens" xmlns="http://docbook.org/ns/docbook">
  <title>List of Parser Tokens</title>
@@ -670,7 +670,8 @@
     <row>
      <entry>T_UNSET_CAST</entry>
      <entry>(unset)</entry>
-     <entry>(not documented; casts to &null;)</entry>
+     <entry><link linkend="language.types.typecasting">type-casting</link>
+     (available since PHP 5.0.0)</entry>
     </row>
     <row>
      <entry>T_USE</entry>