Use barn door.

README.md

@@ -337,8 +337,8 @@ and thermostat.
 
 ![](https://fiware.github.io/tutorials.Subscriptions/img/fmis.png)
 
-Remove some hay from the barn, update the thermostat and open the device monitor page at
-`http://localhost:3000/device/monitor` and start a **Tractor** and switch on a **Smart Lamp**. This can be done by
+Open the device monitor page at `http://localhost:3000/device/monitor` and open the
+barn door. This can be done by
 selecting an appropriate command from the drop-down list and pressing the `send` button. The stream of measurements
 coming from the devices can then be seen on the same page.