diff --git a/cylc/flow/scheduler.py b/cylc/flow/scheduler.py
index 71aaab31ca6..5eb3e03583d 100644
--- a/cylc/flow/scheduler.py
+++ b/cylc/flow/scheduler.py
@@ -910,7 +910,7 @@ def queue_command(
     ) -> str:
         """Queue a command for action by the scheduler.
 
-        Return a unique ID for the command.
+        Return a unique command ID for provenance tracking.
         """
         args_string = ', '.join(str(a) for a in args)
         kwargs_string = ', '.join(