diff --git a/README.md b/README.md
index 7e0230d..e8364eb 100644
--- a/README.md
+++ b/README.md
@@ -5,20 +5,32 @@ in PHP, such as WordPress or Drupal.
 
 ## How to use
 
-First, you have to define some constants to point to your Rocket Chat instance
+This Rocket Chat client is installed via [Composer](http://getcomposer.org/). To install, simply add it
+to your `composer.json` file:
+
+```json
+{
+    "require": {
+        "fab1en/rocket-chat-rest-client": "dev-master"
+    }
+}
+```
+
+And run composer to update your dependencies:
+
+    $ curl -s http://getcomposer.org/installer | php
+    $ php composer.phar update
+
+Then, import the `autoload.php` from your `vendor` folder.
+
+After this, you have to define some constants to point to your Rocket Chat instance
+
 ```php
 define('REST_API_ROOT', '/api/v1/');
 define('ROCKET_CHAT_INSTANCE', 'https://my-rocket-chat-instance.example.org');
 ```
-Then, import the files you need (TODO : implement autoloading)
-```php
-require_once 'src/RocketChatClient.php';
-require_once 'src/RocketChatUser.php';
-require_once 'src/RocketChatGroup.php';
-require_once 'src/RocketChatChannel.php';
-require_once 'src/RocketChatSettings.php';
-```
-Finaly, instance the classes you need :
+
+Finally, instance the classes you need:
 ```php
 $api = new \RocketChat\Client();
 echo $api->version(); echo "\n";
diff --git a/composer.json b/composer.json
index 7ee4ca8..9e25e0b 100644
--- a/composer.json
+++ b/composer.json
@@ -4,5 +4,8 @@
     "autoload": {
         "classmap": ["src/"]
     },
-    "minimum-stability": "stable"
+    "minimum-stability": "stable",
+    "require": {
+        "nategood/httpful": "*"
+    }
 }
diff --git a/src/RocketChatChannel.php b/src/RocketChatChannel.php
index 75d2938..a7454d5 100644
--- a/src/RocketChatChannel.php
+++ b/src/RocketChatChannel.php
@@ -1,7 +1,7 @@
 <?php
 
 namespace RocketChat;
-require_once 'lib/httpful.phar';
+
 use Httpful\Request;
 use RocketChat\Client;
 
@@ -128,5 +128,24 @@ public function kick( $user ){
 		}
 	}
 
+	/**
+	 * Adds user to channel.
+	 */
+	public function invite( $user ) {
+
+		$userId = is_string($user) ? $user : $user->id;
+
+		$response = Request::post( $this->api . 'channels.invite' )
+			->body(array('roomId' => $this->id, 'userId' => $userId))
+			->send();
+
+		if( $response->code == 200 && isset($response->body->success) && $response->body->success == true ) {
+			return true;
+		} else {
+			echo( $response->body->error . "\n" );
+			return false;
+		}
+	}
+
 }
 
diff --git a/src/RocketChatClient.php b/src/RocketChatClient.php
index 4f853bd..f619ff0 100644
--- a/src/RocketChatClient.php
+++ b/src/RocketChatClient.php
@@ -1,7 +1,7 @@
 <?php
 
 namespace RocketChat;
-require_once 'lib/httpful.phar';
+
 use Httpful\Request;
 
 class Client{
@@ -32,7 +32,7 @@ public function version() {
 	public function me() {
 		$response = Request::get( $this->api . 'me' )->send();
 
-		if( $response->body->status != 'error' ) { 
+		if( $response->body->status != 'error' ) {
 			if( isset($response->body->success) && $response->body->success == true ) {
 				return $response->body;
 			}
@@ -41,7 +41,7 @@ public function me() {
 			return false;
 		}
 	}
-	
+
 	/**
 	* List all of the users and their information.
 	*
diff --git a/src/RocketChatGroup.php b/src/RocketChatGroup.php
index 4079e5a..2ef13b6 100644
--- a/src/RocketChatGroup.php
+++ b/src/RocketChatGroup.php
@@ -1,7 +1,7 @@
 <?php
 
 namespace RocketChat;
-require_once 'lib/httpful.phar';
+
 use Httpful\Request;
 use RocketChat\Client;
 
@@ -128,5 +128,24 @@ public function kick( $user ){
 		}
 	}
 
+	/**
+	 * Adds user to the private group.
+	 */
+	public function invite( $user ) {
+
+		$userId = is_string($user) ? $user : $user->id;
+
+		$response = Request::post( $this->api . 'groups.invite' )
+			->body(array('roomId' => $this->id, 'userId' => $userId))
+			->send();
+
+		if( $response->code == 200 && isset($response->body->success) && $response->body->success == true ) {
+			return true;
+		} else {
+			echo( $response->body->error . "\n" );
+			return false;
+		}
+	}
+
 }
 
diff --git a/src/RocketChatSettings.php b/src/RocketChatSettings.php
index 21deea4..cda4a5a 100644
--- a/src/RocketChatSettings.php
+++ b/src/RocketChatSettings.php
@@ -1,7 +1,7 @@
 <?php
 
 namespace RocketChat;
-require_once 'lib/httpful.phar';
+
 use Httpful\Request;
 use RocketChat\Client;
 
@@ -65,7 +65,7 @@ public function check(){
 
 		foreach($settings as $id => $value){
 			$check_val = $this->get($id);
-			
+
 			if(is_object($value) && is_object($check_val) && $value == $check_val) {
 				// object comparison
 				continue;
diff --git a/src/RocketChatUser.php b/src/RocketChatUser.php
index 0f24053..fd21dae 100644
--- a/src/RocketChatUser.php
+++ b/src/RocketChatUser.php
@@ -1,7 +1,7 @@
 <?php
 
 namespace RocketChat;
-require_once 'lib/httpful.phar';
+
 use Httpful\Request;
 use RocketChat\Client;
 
@@ -70,7 +70,7 @@ public function info() {
 	*/
 	public function create() {
 		$response = Request::post( $this->api . 'users.create' )
-			->body(array( 
+			->body(array(
 				'name' => $this->nickname,
 				'email' => $this->email,
 				'username' => $this->username,
diff --git a/src/lib/httpful.phar b/src/lib/httpful.phar
deleted file mode 100644
index 87fb392..0000000
Binary files a/src/lib/httpful.phar and /dev/null differ