diff --git a/sshtool b/sshtool
index 474cb6d..0cbf1dc 100755
--- a/sshtool
+++ b/sshtool
@@ -13,7 +13,7 @@ CMDFILE=./$(basename $CMDFILE)
 
 CLUSTER="$1"
 if [ -z "$CLUSTER" ] || [ ! -d "cluster/$CLUSTER" ]; then
-	echo "Usage: $CMDFILE <cluster name>"
+	echo "Usage: $CMDFILE <cluster name> [host1] [host2] [...]"
 	echo "The cluster name must be the name of a subdirectory of cluster/"
 	exit 1
 fi