diff --git a/README.md b/README.md
index f508357..e4fa508 100644
--- a/README.md
+++ b/README.md
@@ -25,3 +25,16 @@ Run without arguments to show the full syntax (including how to pass your Gandi
 Put in a *cron job* to run on a regular basis and check if there was any change in the IP addresses of the email providers.
 
 Without flattening, the 5 email providers from this example would produce 12 DNS requests, out of maximum 10 allowed.
+
+## Sample crontab
+
+The following cron entry will :
+1. be triggered every hour
+2. wait for random minutes
+3. run the script for the given domain
+4. exit if running more than 3 minutes (timeout)
+5. write debug logs into /var/log/
+
+Make sure to define your API key (may be passed as an environment variable).
+
+    @hourly sleep $((RANDOM*60/32768))m ; timeout --signal=9 3m /opt/gandi-flatten-spf.py -k ${GANDI_APIKEY} -d mydomain.com -e _spf.mailfence.com _spf.google.com _spf.mail.yahoo.com _mailcust.gandi.net _spf.protonmail.ch -l DEBUG >/var/log/gandi-flatten-spf-mydomain.com.log 2>&1