diff --git a/src/allmydata/test/web/test_common.py b/src/allmydata/test/web/test_common.py
index 5bc8ce4f0..6431ba610 100644
--- a/src/allmydata/test/web/test_common.py
+++ b/src/allmydata/test/web/test_common.py
@@ -60,7 +60,7 @@ class StaticResource(Resource, object):
 
 class RenderExceptionTests(SyncTestCase):
     """
-    Tests for ``render_exception``.
+    Tests for ``render_exception`` (including the private helper ``_finish``).
     """
     def test_exception(self):
         """