diff --git a/README.md b/README.md
index 2447865..4c36dbb 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,8 @@ try:
         print '  Password   : {}'.format(user.password)
         print '  Group ID   : {}'.format(user.group_id)
         print '  User  ID   : {}'.format(user.user_id)
+
+    zk.enable_device()
 except Exception, e:
     print "Process terminate : {}".format(e)
 finally: