diff --git a/nova/api/auth.py b/nova/api/auth.py
index 201d57fbde4d..3fb826e7b1bb 100644
--- a/nova/api/auth.py
+++ b/nova/api/auth.py
@@ -33,7 +33,7 @@ auth_opts = [
                 default=False,
                 help='Whether to use per-user rate limiting for the api. '
                      'This option is only used by v2 api. Rate limiting '
-                     'is removed from v3 api.'),
+                     'is removed from v2.1 api.'),
     cfg.StrOpt('auth_strategy',
                default='keystone',
                help='''