diff --git a/README b/README
index 01b3ecf..8e8c145 100644
--- a/README
+++ b/README
@@ -33,6 +33,7 @@ Usage
     -n   Nagios mode
     -d   Download new release
     -u   Upgrade installation
+    -a   Just run after_upgrade function
     -j   Just display current stable version
     -h   Display this help