diff --git a/README.md b/README.md
index fb0edaf..b677a72 100644
--- a/README.md
+++ b/README.md
@@ -1,19 +1,19 @@
 ## Overview
 
-GetResponse API v3 wrapper working on PHP 5.2+.
+GetResponse API v3 wrapper working on PHP 5.3+.
 [Here](http://apidocs.getresponse.com/en/v3/) you can find our api documentation.
 
 ##Examples
 
 Standard authorization
 ```php
-$getresponse = new GetResponse('your_api_key');
+$getresponse = new GetResponse\GetResponse('your_api_key');
 ```
 --
 
 Enterprise authorization
 ```php
-$getresponse = new GetResponse('your_api_key');
+$getresponse = new GetResponse\GetResponse('your_api_key');
 $getresponse->enterprise_domain = 'somedomain.com';
 
 //api URL is relative to your domain UR:
diff --git a/composer.json b/composer.json
index 3bd66e2..715f52c 100644
--- a/composer.json
+++ b/composer.json
@@ -1,10 +1,8 @@
 {
     "name": "getresponse/getresponse",
     "description": "GetResponse API v3 client library.",
-    "version": "0.0.2",
     "homepage": "https://github.com/GetResponse/getresponse-api-php",
     "keywords": ["GetResponse", "api", "email"],
-    "type": "library",
     "license": "MIT",
     "authors": [
         {
@@ -17,10 +15,12 @@
         }
     ],
     "require": {
-        "php": ">=5.2.0",
+        "php": ">=5.3.0",
         "ext-curl": "*"
     },
     "autoload": {
-        "files": ["src/GetResponseAPI3.class.php"]
+        "psr-4": {
+            "GetResponse\\": "src/"
+        }
     }
-}
\ No newline at end of file
+}
diff --git a/src/GetResponseAPI3.class.php b/src/GetResponse.php
similarity index 99%
rename from src/GetResponseAPI3.class.php
rename to src/GetResponse.php
index 2782e2f..06bfedc 100644
--- a/src/GetResponseAPI3.class.php
+++ b/src/GetResponse.php
@@ -1,5 +1,7 @@
 <?php
 
+namespace GetResponse;
+
 /**
  * GetResponse API v3 client library
  *
@@ -403,4 +405,4 @@ private function setParams($params = array())
         return http_build_query($result);
     }
 
-}
\ No newline at end of file
+}