diff --git a/Lib/bsddb/test/test_env_close.py b/Lib/bsddb/test/test_env_close.py
index 87ad97f27a4b..0b46ee30906a 100644
--- a/Lib/bsddb/test/test_env_close.py
+++ b/Lib/bsddb/test/test_env_close.py
@@ -61,6 +61,8 @@ def test01_close_dbenv_before_db(self):
                    "DB close did not raise an exception about its "\
                    "DBEnv being trashed"
 
+        # XXX This may fail when using older versions of BerkeleyDB.
+        # E.g. 3.2.9 never raised the exception.
         assert 0, "dbenv did not raise an exception about its DB being open"