diff --git a/lib/command.js b/lib/command.js
index 82e744e37..2634596ad 100644
--- a/lib/command.js
+++ b/lib/command.js
@@ -1526,9 +1526,9 @@ Expecting one of '${allowedValues.join("', '")}'`);
 
       // Not a recognised option by this command. Might be
       // - a subcommand,
-      // - a command-argument,
-      // - the help option encountered after a subcommand,
-      // - or an option unknown to this command.
+      // - the help option encountered after a subcommand (considered unknown),
+      // - any other option unknown to this command,
+      // - or a command-argument.
 
       const allArgsConsumedAsOptionsSoFar = operands.length === 0 && unknown.length === 0;
       if (!subcommandEncountered && allArgsConsumedAsOptionsSoFar) {