Added changelog note
diff --git a/CHANGES b/CHANGES
index bc6d123..1c7caf4 100644
--- a/CHANGES
+++ b/CHANGES
@@ -8,6 +8,8 @@
 - Fixed a bug with ``call_filter`` not working properly on environment
   and context filters.
 - Fixed lack of Python 3 support for bytecode caches.
+- Reverted support for defining blocks in included templates as this
+  broke existing templates for users.
 
 Version 2.7
 -----------