diff --git a/cluster/maco.check.update.sh b/cluster/maco.check.update.sh
index 29cd5ac..b095332 100755
--- a/cluster/maco.check.update.sh
+++ b/cluster/maco.check.update.sh
@@ -42,7 +42,7 @@ readonly MACO_TMP_URGENT_FILE="/tmp/.maco.urgent.upgrade"
 usage() {                                                       # {{{
 
 	cat <<- EOF
-usage: $PROGNAME
+usage: $PROGNAME [-h,--help|-d,--debug|-s,--simulate]
 
 Compare current version of Maco script with the latest and
  the urgent versions then try to prepare the host by: