diff --git a/reference/spl/datastructures.xml b/reference/spl/datastructures.xml
index 0220ff0bbd..e829c7cf4d 100644
--- a/reference/spl/datastructures.xml
+++ b/reference/spl/datastructures.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
 
 <part xml:id="spl.datastructures" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 
@@ -73,6 +73,21 @@
    </itemizedlist>
 
   </section>
+
+  <section>
+   <title>Map</title>
+
+   <para>
+    A map is a datastructure holding key-value pairs. PHP arrays can be seen as maps from integers/strings to values. SPL provides a map from objects to data. This map can aswell be used as a object set.
+   </para>
+
+   <itemizedlist>
+    <listitem>
+     <simpara><classname>SplObjectStorage</classname></simpara>
+    </listitem>
+   </itemizedlist>
+
+  </section>
  </partintro>
 
  &reference.spl.spldoublylinkedlist;
@@ -85,6 +100,7 @@
  &reference.spl.splpriorityqueue;
 
  &reference.spl.splfixedarray;
+ &reference.spl.splobjectstorage;
 
 </part>