diff --git a/zaza/openstack/charm_tests/tempest/tests.py b/zaza/openstack/charm_tests/tempest/tests.py
index 71c280a..6e21a27 100644
--- a/zaza/openstack/charm_tests/tempest/tests.py
+++ b/zaza/openstack/charm_tests/tempest/tests.py
@@ -146,6 +146,7 @@ class TempestTestScaleK8SBase(TempestTestBase):
 
     @property
     def application_name(self):
+        """Name of application to scale."""
         raise NotImplementedError()
 
     @property