groupby now supports attributes of attributes.  This fixes #10
diff --git a/CHANGES b/CHANGES
index b171ac2..87f705c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -13,6 +13,8 @@
   allows application developers to disable builtin operators for better
   security.  (For instance limit the mathematical operators to actual
   integers instead of longs)
+- groupby filter now supports dotted notation for grouping by attributes
+  of attributes.
 
 Version 2.5.5
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