Update README.md

Author: artemlos

README.md

@@ -44,6 +44,8 @@ In order to adjust this code to your products, several parameters needs to be ch
 * `key` - the license key to be verified (above it's MPDWY-PQAOW-FKSCH-SGAAU).
 * `machine_code` - the unique id of the device, which may require root access. Note, this value is not the same as the one generated by the .NET client.
 
+> Note: The code above assumes that node-locking is enabled. By default, license keys created with Maximum Number of Machines set to zero, which deactivates node-locking. As a result, machines will not be registered and the call to Helpers.IsOnRightMachine(license) will return False. You can read more about this behaviour [here](https://help.cryptolens.io/faq/index#maximum-number-of-machines). For testing purposes, please feel free to remove Helpers.IsOnRightMachine(license) from the if statement.
+
 ### Offline activation (saving/loading licenses)
 Assuming the license key verification was successful, we can save the result in a file so that we can use it instead of contacting Cryptolens.