diff --git a/README.md b/README.md
index 2c10b4f..7e97557 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,8 @@ linux-user
 ==========
 Node module for Linux user and group control.
 
-Use Node to manage Linux user easily. All APIs do what you think.
+Use Node to manage Linux user easily. All APIs do what you think. Promise and 
+`async\await` out of the box. **Zero dependences!**
 
 **The module must be running on Linux and as root user !**
 
@@ -81,12 +82,25 @@ linuxUser.getUsers(function (err, users) {
 
 ### Promises
 
-This project works with promises right out of the box! Just grade the promise function
+This project works with promises right out of the box! Just grab the promise
+function.
 
 ```js
-var linuxUser = require('linux-sys-user').promise;
+var linuxUser = require('linux-sys-user').promise();
 ```
 
+This will NodeJS's `util.promisify` by default. You can pass your own promisify
+function like, like bluebird:
+
+```js
+var bluebird = require('bluebird');
+var linuxUser = require('linux-sys-user').promise(bluebird.promisify);
+
+```
+
+** `bluebird` is NOT included with this package! ** If you are using a older
+version of NodeJS( less then 8 ) you will need something like it.
+
 This will work with `.then()`, `.catch()` and the `async`/`await` pattern.
 
 ```js
@@ -139,8 +153,8 @@ console.log(user);
         missing.
         ```
 
-      * `expiredate` *String* The date on which the user account will be disabled.
-      The date is specified in the format `YYYY-MM-DD`..
+      * `expiredate` *String* The date on which the user account will be
+      disabled. The date is specified in the format `YYYY-MM-DD`..
 
       ```
       If not specified, useradd will use the default expiry date
@@ -182,8 +196,8 @@ console.log(user);
       * `selinux_user` *String* The SELinux user for the user's login.
 
       ```
-      The default is to leave this field blank, which causes the system to select
-      the default SELinux user.
+      The default is to leave this field blank, which causes the system to
+      select the default SELinux user.
       ```
 
 	* callback function(err, userInfo)
diff --git a/index.js b/index.js
index b6fddc3..1c23396 100644
--- a/index.js
+++ b/index.js
@@ -1,16 +1,16 @@
 'use strict';
 
-var bluebird= require('bluebird');
-var lib = require('./lib/user');
-
-lib.promise = (function(lib) {
-	var out = {};
+// ensure process is running on linux
+if(process.platform !== 'linux') {
+	throw new Error('linux-user must be running on Linux');
+}
 
-	Object.keys(lib).forEach(function(key){
- 		out[key] = bluebird.promisify(lib[key]);
-	});
+// ensure process is running as root
+if(!(process.getuid && process.getuid() === 0)) {
+	throw new Error('linux-user must be running as root user');
+}
 
-	return out;
-})(lib);
+var lib = require('./lib/user');
+lib.promises = require('./lib/promise')
 
 module.exports = lib;
diff --git a/lib/promise.js b/lib/promise.js
new file mode 100644
index 0000000..11647e7
--- /dev/null
+++ b/lib/promise.js
@@ -0,0 +1,16 @@
+
+var promise = function(promise_fn) {
+	var lib = require('./user');
+	
+	promise_fn = promise_fn || util.promisify;
+
+	var out = {};
+
+	Object.keys(lib).forEach(function(key){
+ 		out[key] = promise_fn(lib[key]);
+	});
+
+	return out;
+}
+
+module.exports = promise;
diff --git a/lib/user.js b/lib/user.js
index 7f38e90..13e2fad 100644
--- a/lib/user.js
+++ b/lib/user.js
@@ -5,22 +5,12 @@ var exec = require('child_process').exec;
 var spawn = require('child_process').spawn;
 var fs = require('fs');
 
-if(process.platform !== 'linux') {
-  throw new Error('linux-user must be running on Linux');
-}
-
-// ensure process is running as root
-if(!(process.getuid && process.getuid() === 0)) {
-  throw new Error('linux-user must be running as root user');
-}
-
 var validUsernameRegex = /^([a-z_][a-z0-9_-]{0,30})$/;
 
 function validate (username) {
-  return validUsernameRegex.test(username);
+     return validUsernameRegex.test(username);
 }
 
-exports.validateUsername = validate;
 
 var user_arg_map = {
   shell: function(SHELL){
@@ -296,3 +286,6 @@ exports.addSSHtoUser = function (user, key, callback){
     });
   });
 };
+
+
+exports.validateUsername = validate;
diff --git a/package-lock.json b/package-lock.json
index 30677bf..b9dd25b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "linux-sys-user",
-  "version": "0.6.2",
+  "version": "0.6.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -40,11 +40,6 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
-    "bluebird": {
-      "version": "3.5.5",
-      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.5.tgz",
-      "integrity": "sha512-5am6HnnfN+urzt4yfg7IgTbotDjIT/u8AJpEt0sIU9FtXfVeezXAPKswrG+xKUCOYAINpSdgZVDU6QFh+cuH3w=="
-    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
diff --git a/package.json b/package.json
index 8452fbb..dbd4918 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "linux-sys-user",
-  "version": "0.6.3",
+  "version": "1.0.0",
   "description": "Node module for Linux user and group control.",
   "author": [
     {
@@ -43,7 +43,5 @@
     "type": "git",
     "url": "https://github.com/wmantly/linux-user.git"
   },
-  "dependencies": {
-    "bluebird": "^3.5.5"
-  }
+  "dependencies": {}
 }