update README.md

Author: pyr0hu

README.md

@@ -88,6 +88,8 @@ If you use **Lumen**, you need to copy the config file manually and register the
 $this->app->register(\BeyondCode\QueryDetector\LumenQueryDetectorServiceProvider::class);
 ```
 
+If you need additional logic to run when the package detects unoptimized queries, you can listen to the `\BeyondCode\QueryDetector\Events\QueryDetected` event and write a listener to run your own handler. (e.g. send warning to Sentry/Bugsnag, send Slack notification, etc.)
+
 ### Testing
 
 ``` bash