diff --git a/language/control-structures/alternative-syntax.xml b/language/control-structures/alternative-syntax.xml
index d9781b1a5b..2a5b1784a5 100644
--- a/language/control-structures/alternative-syntax.xml
+++ b/language/control-structures/alternative-syntax.xml
@@ -51,6 +51,11 @@ endif;
    </programlisting>
   </informalexample>
  </para>
+ <note>
+  <para>
+   Missing the syntax is not supported in the same controle block is not supported.
+  </para>
+ </note>
  <para>
   See also <link linkend="control-structures.while">while</link>,
   <link linkend="control-structures.for">for</link>, and <link