diff --git a/lib/command.js b/lib/command.js
index ffb19844d..ea4481df9 100644
--- a/lib/command.js
+++ b/lib/command.js
@@ -1514,6 +1514,7 @@ Expecting one of '${allowedValues.join("', '")}'`);
 
       // Not a recognised option by this command. Might be
       // - a subcommand,
+      // - the help option (currently not handled by this routine),
       // - an option unknown to this command,
       // - or a command-argument.