diff --git a/reference/array/functions/array-diff.xml b/reference/array/functions/array-diff.xml
index 68e54d72bf..ea924525a1 100644
--- a/reference/array/functions/array-diff.xml
+++ b/reference/array/functions/array-diff.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.4 $ -->
+<!-- $Revision: 1.5 $ -->
 <!-- splitted from ./en/functions/array.xml, last change in rev 1.14 -->
   <refentry id="function.array-diff">
    <refnamediv>
@@ -45,6 +45,13 @@ $result = array_diff ($array1, $array2);
       <!-- TODO: example of it... -->
      </simpara>
     </note>
+    <note>
+     <simpara>
+      Please note that this function only checks one dimension of a n-dimensional
+      array. Of course you can check deeper dimensions by using
+      <literal>array_diff($array1[0], $array2[0]);</literal>.
+     </simpara>
+    </note>
     <warning>
      <simpara>
       This was broken in PHP 4.0.4!