diff --git a/lib/_debugger.js b/lib/_debugger.js
index b8a3177d68..c4155ce4c7 100644
--- a/lib/_debugger.js
+++ b/lib/_debugger.js
@@ -33,6 +33,8 @@ exports.start = function(argv, stdin, stdout) {
 
   if (argv.length < 1) {
     console.error('Usage: node debug script.js');
+    console.error('       node debug <host>:<port>');
+    console.error('       node debug -p <pid>');
     process.exit(1);
   }