diff --git a/README.md b/README.md
index 0d2eac6..25e94bb 100644
--- a/README.md
+++ b/README.md
@@ -86,3 +86,12 @@ This can be done by adapting the `/etc/postfix/transport/`
 
 - postmap the configuration file (if needed) : `postmap /etc/postfix/transport`
 - restart postfix : `systemctl restart postfix`
+
+## Import emails to piler
+
+Previous emails are sent automatically one time to piler after the first configuration, but if you want to launch manually the synchronisation, you can trigger this service in the terminal:
+
+    runagent -m piler1
+    systemctl --user start import-email-to-piler.service
+
+Piler should understand and manage about duplicated emails.
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