Be clear about the usage example

docs/tutorial/updates.md

@@ -14,7 +14,9 @@ Depending on your needs, you can choose from one of these:
 
 ## Implementing Updates into Your App
 
-Once you've deployed your update server, continue with importing the required modules in your code (please ensure that the code below will only be executed in production - you can use [electron-is-dev](https://github.com/sindresorhus/electron-is-dev) for that):
+Once you've deployed your update server, continue with importing the required modules in your code. The following code might vary for a different update server, but it works like described when using [Hazel](https://github.com/zeit/hazel).
+
+**Important:** Please ensure that the code below will only be executed in production - you can use [electron-is-dev](https://github.com/sindresorhus/electron-is-dev) to check for the environment).
 
 ```js
 const { app, autoUpdater } = require('electron')