diff --git a/reference/spl/spldoublylinkedlist.xml b/reference/spl/spldoublylinkedlist.xml
index 40db1ae48d..ac57d9ef8e 100644
--- a/reference/spl/spldoublylinkedlist.xml
+++ b/reference/spl/spldoublylinkedlist.xml
@@ -41,6 +41,10 @@
       <interfacename>Countable</interfacename>
      </oointerface>
  
+     <oointerface>
+      <interfacename>Serializable</interfacename>
+     </oointerface>
+ 
     </classsynopsisinfo>
 <!-- }}} -->