diff --git a/CHANGES.txt b/CHANGES.txt
index f7e6f1d..b8ebc9c 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,14 @@
 
+0.1a21
+------
+
+- [feature] Added the ability to specify a Mako template for use when
+  generating error emails.  Templates may be referenced in the config file
+  using either a resource path or an absolute file path.  If no template is
+  specified, the plain text fallback will be used.  The ``content_type`` of the
+  email is also configurable (defaults to ``'text/html'`` if a Mako template is
+  used; ``'text/plain'`` otherwise).
+
 0.1a20
 ------