--- a/README.rst	Wed Dec 05 02:45:25 2012 +0900
+++ b/README.rst	Tue Dec 11 23:15:40 2012 +0900
@@ -15,7 +15,7 @@
 
   var shelf = Backbone.Shard({
     collection: books,
-    filter: function(book) { return task.get('read'); }
+    filter: function(book) { return book.get('read'); }
   });
   
   read.each(...);