diff --git a/README.md b/README.md
index 9a1387d..1d3ce5e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # [coone][author-www-url] [![npmjs.com][npmjs-img]][npmjs-url] [![The MIT License][license-img]][license-url] 
 
-> Acts like [co@3](https://github.com/tj/co/tree/93fd2bb5e8803fdde15d95b3025b0b134904f4dc), on top of [always-done](https://github.com/hybridables/always-done). But accept everything, not only generators - sync functions, async functions, callbacks and more. Flow-control for now and then.
+> Acts like [co@4](https://github.com/tj/co/tree/93fd2bb5e8803fdde15d95b3025b0b134904f4dc) and also is drop-in replacement for it. Built on top of [merz](https://github.com/hybridables/merz), actually thanks to [always-done](https://github.com/hybridables/always-done). But accept everything, not only generators - sync functions, async functions, callbacks and more. Flow-control for now and then.
 
 [![code climate][codeclimate-img]][codeclimate-url] [![standard code style][standard-img]][standard-url] [![travis build status][travis-img]][travis-url] [![coverage status][coveralls-img]][coveralls-url] [![dependency status][david-img]][david-url]
 
diff --git a/package.json b/package.json
index ba8625c..55f85dc 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "coone",
   "version": "0.0.0",
-  "description": "Acts like `co3`, on top of `always-done`. But accept everything, not only generators - sync functions, async functions, callbacks and more. Flow-control for now and then.",
+  "description": "Acts like `co@3` and also is drop-in replacement for it. Built on top of `merz`, actually thanks to `always-done`. But accept everything, not only generators - sync functions, async functions, callbacks and more. Flow-control for now and then.",
   "repository": "hybridables/coone",
   "author": "Charlike Mike Reagent <@tunnckoCore> (http://www.tunnckocore.tk)",
   "main": "index.js",
@@ -18,6 +18,7 @@
     "bluebird": "^2.10.1",
     "mz": "^2.0.0",
     "rx": "^4.0.0",
+    "semver": "^5.0.3",
     "simple-get": "^1.4.3",
     "through2": "^2.0.0"
   },
diff --git a/test.js b/test.js
index 0270711..dc5a4e6 100644
--- a/test.js
+++ b/test.js
@@ -10,6 +10,7 @@
 'use strict'
 
 var test = require('assertit')
+var semver = require('semver')
 
 test('errors', function (done) {
   require('./test/errors')
@@ -45,3 +46,10 @@ test('child processes', function (done) {
   require('./test/child_processes')
   done()
 })
+
+if (semver.gte(process.version, '0.11.13')) {
+  test('generators', function (done) {
+    require('./test/generators')
+    done()
+  })
+}
diff --git a/test/generators.js b/test/generators.js
new file mode 100644
index 0000000..a978259
--- /dev/null
+++ b/test/generators.js
@@ -0,0 +1,41 @@
+/*!
+ * coone <https://github.com/hybridables/coone>
+ *
+ * Copyright (c) 2015 Charlike Mike Reagent <@tunnckoCore> (http://www.tunnckocore.tk)
+ * Released under the MIT license.
+ */
+
+/* jshint asi:true */
+
+'use strict'
+
+var mzfs = require('mz/fs')
+var test = require('assertit')
+var coone = require('../index')
+
+function * success () {
+  return yield mzfs.readFile('package.json', 'utf8')
+}
+
+function * failure () {
+  return yield mzfs.readFile('foobar.json')
+}
+
+test('should handle successful generator function', function (done) {
+  coone(success)(function (err, res) {
+    test.ifError(err)
+    test.strictEqual(typeof res, 'string')
+    test.ok(res.indexOf('"license": "MIT"') !== -1)
+    done()
+  })
+})
+
+test('should handle generator function errors', function (done) {
+  coone(failure)(function (err, res) {
+    test.ifError(!err)
+    test.ok(err instanceof Error)
+    test.strictEqual(err.code, 'ENOENT')
+    test.strictEqual(res, undefined)
+    done()
+  })
+})