--- a/Model/DocumentInterface.php	Tue Oct 25 12:20:47 2011 +0200
+++ b/Model/DocumentInterface.php	Wed Oct 26 15:38:05 2011 +0200
@@ -11,6 +11,8 @@
 
 namespace IRI\Bundle\WikiTagBundle\Model;
 
+use Doctrine\Common\Collections\ArrayCollection;
+
 interface DocumentInterface {
     
     /**