Added instruction to clear the job queue

README.md

@@ -40,3 +40,13 @@ composer run dev
 ```
 
 And go with your favorite browser to <http://127.0.0.1:8000/>
+
+### Nothing is happening when I press "Lancer"
+
+Look a the output of `composer run dev`, if you see that reverb is still sending events, that means you need to clear the job queue in a new terminal with the command
+
+```shell
+php artisan queue:clear
+```
+
+You then need to repress the "Lancer" button.