diff --git a/learn-generators.js b/learn-generators.js
index 17c254c..29da4f3 100755
--- a/learn-generators.js
+++ b/learn-generators.js
@@ -1,8 +1,14 @@
-#!/usr/bin/env node
+#!/usr/bin/env node --harmony
 
-const workshopper = require('workshopper'),
-      path        = require('path')
-      credits     = require('./credits')
+const workshopper   = require('workshopper'),
+      path          = require('path'),
+      credits       = require('./credits'),
+      hasGenerators = require('has-generators')
+
+if(!hasGenerators) {
+  console.error('You need nodejs >= 0.11.x or iojs >= 1.0.x to work with generators.')
+  process.exit()
+}
 
 function fpath (f) {
     return path.join(__dirname, f)
diff --git a/package.json b/package.json
index 7d9126d..2df8ac6 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
   ],
   "dependencies": {
     "colors-tmpl": "~1.0.0",
+    "has-generators": "^1.0.1",
     "workshopper": "^2.1.1",
     "workshopper-exercise": "^2.1.0",
     "workshopper-wrappedexec": "^0.1.2"