diff --git a/tempest/config.py b/tempest/config.py
index 9b1a91e..c6a291e 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -515,7 +515,10 @@
                help='regexp for list of log files.'),
     cfg.StrOpt('log_check_interval',
                default=60,
-               help='time between log file error checks.')
+               help='time (in seconds) between log file error checks.'),
+    cfg.StrOpt('default_thread_number_per_action',
+               default=4,
+               help='The number of threads created while stress test.')
 ]