1 files changed, 6 insertions, 1 deletions
diff --git a/tests/unittest.py b/tests/unittest.py
index c9a08a3420..165aafc574 100644
--- a/tests/unittest.py
+++ b/tests/unittest.py
@@ -331,7 +331,12 @@ class HomeserverTestCase(TestCase):
             time.sleep(0.01)
 
     def wait_for_background_updates(self) -> None:
-        """Block until all background database updates have completed."""
+        """
+        Block until all background database updates have completed.
+
+        Note that callers must ensure that's a store property created on the
+        testcase.
+        """
         while not self.get_success(
             self.store.db_pool.updates.has_completed_background_updates()
         ):