diff --git a/README.rst b/README.rst
index e50fe6c..80e2fb0 100644
--- a/README.rst
+++ b/README.rst
@@ -27,6 +27,9 @@ the following content::
     DEBUG = True
     SQLACHEMY_ECHO = DEBUG
 
+You can also set the `TESTING` flag to `True` so no mails are sent 
+(and no exception is raised) while you're on development mode.
+
 Deploy it
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