diff --git a/cylc/flow/scripts/stop.py b/cylc/flow/scripts/stop.py
index d49a47aea1e..ebdb6380cd7 100755
--- a/cylc/flow/scripts/stop.py
+++ b/cylc/flow/scripts/stop.py
@@ -40,7 +40,8 @@
   $ cylc stop my_workflow//1234/foo
 
 By default stopping workflows wait for submitted and running tasks to complete
-before shutting down. You can change this behaviour with the --mode option.
+before shutting down. You can change this behaviour with the --now or
+--kill options.
 
 There are several shutdown methods: