diff --git a/doc/source/microversion_testing.rst b/doc/source/microversion_testing.rst
index ce9bbb5..2059650 100644
--- a/doc/source/microversion_testing.rst
+++ b/doc/source/microversion_testing.rst
@@ -334,6 +334,10 @@
 
   .. _2.26: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id23
 
+* `2.28`_
+
+  .. _2.28: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id25
+
   * `2.32`_
 
   .. _2.32: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id29