diff --git a/ContentDirectory.py b/ContentDirectory.py
index c8d3099..d94633e 100644
--- a/ContentDirectory.py
+++ b/ContentDirectory.py
@@ -37,8 +37,8 @@ class ContentDirectoryControl(UPnPPublisher, dict):
 	self.nextID += 1
 	return ret
 
-    def addContainer(self, parent, title, **kwargs):
-	ret = self.addItem(parent, Container, title, **kwargs)
+    def addContainer(self, parent, title, klass = Container, **kwargs):
+	ret = self.addItem(parent, klass, title, **kwargs)
 	self.children[ret] = []
 	return ret