diff --git a/nova/tests/unit/objects/test_service.py b/nova/tests/unit/objects/test_service.py
index 1bee51c552..40c9367c77 100644
--- a/nova/tests/unit/objects/test_service.py
+++ b/nova/tests/unit/objects/test_service.py
@@ -368,7 +368,8 @@ class TestServiceVersion(test.TestCase):
         self.assertEqual(
             current, calculated,
             'Changes detected that require a SERVICE_VERSION change. Please '
-            'increment nova.objects.service.SERVICE_VERSION')
+            'increment nova.objects.service.SERVICE_VERSION, and make sure it'
+            'is equal to nova.compute.manager.ComputeManager.target.version.')
 
     def test_version_in_init(self):
         self.assertRaises(exception.ObjectActionError,