diff --git a/lib/sqlalchemy/exc.py b/lib/sqlalchemy/exc.py
index 6984559fa2..0ce5393bee 100644
--- a/lib/sqlalchemy/exc.py
+++ b/lib/sqlalchemy/exc.py
@@ -161,6 +161,7 @@ class DontWrapMixin(object):
     emitted within the process of executing a statement.
 
     E.g.::
+
         from sqlalchemy.exc import DontWrapMixin
 
         class MyCustomException(Exception, DontWrapMixin):