Index: Zend_Cache-Frontends.xml
===================================================================
--- Zend_Cache-Frontends.xml	(revision 7970)
+++ Zend_Cache-Frontends.xml	(working copy)
@@ -42,6 +42,18 @@
                               </entry>
                           </row>
                           <row>
+                              <entry><code>cache_id_prefix</code></entry>
+                              <entry><code>string</code></entry>
+                              <entry><code>null</code></entry>
+                              <entry>
+                                A prefix for all cache ids, if set to <code>null</code>, no
+                                cache id prefix will be used. The cache id prefix essentially creates
+                                a namespace in the cache, allowing multiple applications or websites
+                                to use a shared cache. Each application or website can use a different
+                                cache id prefix so specific cache ids can be used more than once.
+                              </entry>
+                          </row>
+                          <row>
                               <entry><code>lifetime</code></entry>
                               <entry><code>int</code></entry>
                               <entry><code>3600</code></entry>
