diff --git a/reference/array/functions/array-unique.xml b/reference/array/functions/array-unique.xml
index b088d94289..1208eedb26 100644
--- a/reference/array/functions/array-unique.xml
+++ b/reference/array/functions/array-unique.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.21 $ -->
+<!-- $Revision: 1.22 $ -->
 <refentry xml:id="function.array-unique" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>array_unique</refname>
@@ -166,6 +166,15 @@ array(2) {
    </example>
   </para>
  </refsect1>
+ <refsect1 role="notes">
+  &reftitle.notes;
+  <note>
+   <simpara>
+    Note that <function>array_unique</function> is not intended to 
+    work on multi dimensional arrays.
+   </simpara>
+  </note>
+ </refsect1>
 
 </refentry>