README File

README.md

@@ -135,3 +135,11 @@ Set the options to **carriage return** and **9600 baud**. You should see somethi
 
 It is important you notice not all the measurements are sent to the ThingSpeak platform. The sending occurs every 
 15 seconds only.
+
+## The poll command
+In the Serial Monitor of the Arduino IDE, use the **poll** command to see the readings of the measurements once 
+per second.
+
+## The help command
+The **help** command shows the full list of commands available for the device, along with the description of 
+each one of them.