diff --git a/ChangeLog b/ChangeLog
index 7195dae..17ab183 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-08-29  Niibe Yutaka  <gniibe@fsij.org>
+
+	* tool/hub_ctrl.py (__main__): Fix to busnum (was: bunum).
+	Thanks to Henry Hu.
+
 2012-08-03  Niibe Yutaka  <gniibe@fsij.org>
 
 	* Version 1.0.1.
diff --git a/tool/hub_ctrl.py b/tool/hub_ctrl.py
index 721b7d1..684b3bd 100755
--- a/tool/hub_ctrl.py
+++ b/tool/hub_ctrl.py
@@ -167,7 +167,7 @@ if __name__ == '__main__':
                 option = sys.argv[1]
                 sys.argv.pop(1)
                 if option == '-h':
-                    if bunum != None or devnum != None:
+                    if busnum != None or devnum != None:
                         exit_with_usage(sys.argv[0])
                     hub = int(sys.argv[1])
                     sys.argv.pop(1)