diff --git a/doc/source/reference/exception.rst b/doc/source/reference/exception.rst
index 5dfe5740..b2cfaff2 100644
--- a/doc/source/reference/exception.rst
+++ b/doc/source/reference/exception.rst
@@ -1,6 +1,6 @@
-=============
- exception
-=============
+=========
+exception
+=========
 
 .. automodule:: oslo_versionedobjects.exception
    :members: