diff --git a/README.md b/README.md
index 0bd1839..43c94e4 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,14 @@ initiate the database
 ```bash
 php bin/console doctrine:schema:create
 ```
+## cronjob to delete expired polls
+add this line in your crontab to run the clearance of expired polls everyday at 0h00.
+```
+0 0 * * * wget http://MYWEBSITE/api/v1/clean-polls 
+```
+you can open your crontabl in command line with 
+crontab -e
+
 # About
 
 made by B. Lemoine, aka Tykayn, for the framadate funky front end project, a polling libre software.