diff --git a/language/types.xml b/language/types.xml
index e5b0a70f28..310b70c2cb 100644
--- a/language/types.xml
+++ b/language/types.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.68 $ -->
+<!-- $Revision: 1.69 $ -->
  <chapter id="language.types">
   <title>Types</title>
 
@@ -1167,11 +1167,33 @@ $arr[] = <replaceable>value</replaceable>;
      with arrays, see the <link linkend="ref.array">array-functions</link> 
      section.
     </para>
+    <note>
+     <para>
+      The <function>unset</function> function allows unsetting keys of an 
+      array. Be aware that the array will NOT be reindexed.
+      <informalexample>
+       <programlisting role="php">
+<![CDATA[
+$a = array( 1 => 'one', 2 => 'two', 3 => 'three' );
+unset( $a[2] );
+/* will produce an array that would have been defined as
+   $a = array( 1=>'one', 3=>'three');
+   and NOT
+   $a = array( 1 => 'one', 2 => 'three');
+*/   
+]]>
+      </programlisting>
+     </informalexample>
+     
+     </para>    
+    </note> 
     <para>
      The <link linkend="control-structures.foreach">foreach</link> 
      control structure exists specificly for arrays. It 
      provides an easy way to traverse an array.
     </para>
+    
+    
    </sect2>
    
    <sect2 id="language.types.array.donts">