diff --git a/Lib/test/test_deque.py b/Lib/test/test_deque.py
index 4e2de3d0058..02dadef4fbd 100644
--- a/Lib/test/test_deque.py
+++ b/Lib/test/test_deque.py
@@ -420,7 +420,7 @@ class TestBasic(unittest.TestCase):
             gc.collect()
 
     def test_container_iterator(self):
-        # Bug # XXX: tp_traverse was not implemented for deque iterator objects
+        # Bug #3680: tp_traverse was not implemented for deque iterator objects
         class C(object):
             pass
         for i in range(2):
diff --git a/Lib/test/test_dict.py b/Lib/test/test_dict.py
index 14d62f5024b..0907744ab5f 100644
--- a/Lib/test/test_dict.py
+++ b/Lib/test/test_dict.py
@@ -556,7 +556,7 @@ class DictTest(unittest.TestCase):
         d = {}
 
     def test_container_iterator(self):
-        # Bug # XXX: tp_traverse was not implemented for dictiter objects
+        # Bug #3680: tp_traverse was not implemented for dictiter objects
         class C(object):
             pass
         iterators = (dict.iteritems, dict.itervalues, dict.iterkeys)
diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index 8d057123651..886c4b8db36 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -324,7 +324,7 @@ class TestJointOps(unittest.TestCase):
         self.assertEqual(d3, dict.fromkeys(d, 123))
 
     def test_container_iterator(self):
-        # Bug # XXX: tp_traverse was not implemented for set iterator object
+        # Bug #3680: tp_traverse was not implemented for set iterator object
         class C(object):
             pass
         obj = C()