diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8ef0e14
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+vendor/
+.idea/
diff --git a/OverloadClass.php b/OverloadClass.php
index 2c62ac1..e7f67a2 100644
--- a/OverloadClass.php
+++ b/OverloadClass.php
@@ -11,6 +11,7 @@ class OverloadClass
     const EXTRA_OVERLOAD_CACHE_DIR_DEV = 'composer-overload-cache-dir-dev';
     const EXTRA_OVERLOAD_CLASS = 'composer-overload-class';
     const EXTRA_OVERLOAD_CLASS_DEV = 'composer-overload-class-dev';
+    const EXTRA_OVERLOAD_DUPLICATE_ORIGINAL_FILE = 'duplicate-original-file';
     const NAMESPACE_PREFIX = 'ComposerOverloadClass';
 
     /**
@@ -44,12 +45,17 @@ public static function overload(Event $event)
                 }
 
                 foreach ($extra[$extraKey] as $className => $infos) {
-                    static::generateProxy(
-                        $cacheDir,
-                        $className,
-                        $infos['original-file'],
-                        $event->getIO()
-                    );
+                    if (
+                        array_key_exists(static::EXTRA_OVERLOAD_DUPLICATE_ORIGINAL_FILE, $infos) === false
+                        || $infos[static::EXTRA_OVERLOAD_DUPLICATE_ORIGINAL_FILE] === false
+                    ) {
+                        static::generateProxy(
+                            $cacheDir,
+                            $className,
+                            $infos['original-file'],
+                            $event->getIO()
+                        );
+                    }
                     $autoload['classmap'][$className] = $infos['overload-file'];
                 }
 
diff --git a/README.md b/README.md
index 7131e7c..c773eff 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
-[![version](https://img.shields.io/badge/version-1.1.3-green.svg)](https://github.com/steevanb/composer-overload-class/tree/1.1.3)
+[![version](https://img.shields.io/badge/version-1.2.0-green.svg)](https://github.com/steevanb/composer-overload-class/tree/1.2.0)
 [![composer](https://img.shields.io/badge/composer-^1.0-blue.svg)](https://getcomposer.org)
-![Lines](https://img.shields.io/badge/code%20lines-431-green.svg)
+![Lines](https://img.shields.io/badge/code%20lines-444-green.svg)
 ![Total Downloads](https://poser.pugx.org/steevanb/composer-overload-class/downloads)
-[![SensionLabsInsight](https://img.shields.io/badge/SensionLabsInsight-platinum-brightgreen.svg)](https://insight.sensiolabs.com/projects/a753e540-2863-444f-a174-d743ca475566/analyses/8)
+[![SensionLabsInsight](https://img.shields.io/badge/SensionLabsInsight-platinum-brightgreen.svg)](https://insight.sensiolabs.com/projects/a753e540-2863-444f-a174-d743ca475566/analyses/15)
 [![Scrutinizer](https://scrutinizer-ci.com/g/steevanb/composer-overload-class/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/steevanb/composer-overload-class/)
 
 composer-overload-class
@@ -27,7 +27,7 @@ Installation
 ------------
 
 ```bash
-composer require steevanb/composer-overload-class ^1.1
+composer require steevanb/composer-overload-class ^1.2
 ```
 
 Configuration
@@ -55,7 +55,10 @@ Example taken from [steevanb/doctrine-stats](https://github.com/steevanb/doctrin
                 "__comment": "Path to original file, who contains the class you want to overload",
                 "original-file": "vendor/doctrine/orm/lib/Doctrine/ORM/Internal/Hydration/ObjectHydrator.php",
                 "__comment": "Path to your file, who contains your class",
-                "overload-file": "vendor/steevanb/doctrine-stats/ComposerOverloadClass/Doctrine/ORM/Internal/ObjectHydrator.php"
+                "overload-file": "vendor/steevanb/doctrine-stats/ComposerOverloadClass/Doctrine/ORM/Internal/ObjectHydrator.php",
+                "__comment": "false (default) : duplicate original class, add ComposerOverloadClass namespace prefix, you can extend it",
+                "__comment": "true : do not duplicate original class, you need to write all code in your classe",
+                "duplicate-original-file": false
             }
         },
         "__comment": "Classes to overload, in dev env",
@@ -67,6 +70,8 @@ Example taken from [steevanb/doctrine-stats](https://github.com/steevanb/doctrin
 When configuration is finished, you need to re-generate Composer autoload :
 ```bash
 composer dumpautoload
+
+# show overrided files
 composer dumpautoload -v
 ```
 
@@ -79,7 +84,6 @@ Example taken from steevanb/doctrine-stats, to overload Doctrine ObjectHydrator,
 
 ```php
 # src/ComposerOverloadClass/Doctrine/ORM/Internal/ObjectHydrator.php
-<?php
 
 namespace Doctrine\ORM\Internal\Hydration;
 
diff --git a/changelog.md b/changelog.md
index ec9ae28..854c399 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,33 +1,31 @@
-1.1.3 (2016-12-28)
-------------------
+### [1.2.0](../../compare/1.1.3...1.2.0) (2017-05-29)
 
-- Add static to OverloadClass::createDirectories()
+- Add ```duplicate-original-file``` configuration to indicate if you want to duplicate original classe or not
 
-1.1.2 (2016-12-28)
-------------------
+### [1.1.3](../../compare/1.1.2...1.1.3) (2016-12-28)
 
-- Throw \Exception if extra/composer-overload-cache-dir is not defined in composer.json
-- Write Creating dir when composer is called with -v
-- Write Foo.php is overloaded by Bar.php when composer is called with -v
+- Add ```static``` to ```OverloadClass::createDirectories()```
 
-1.1.1 (2016-11-19)
-------------------
+### [1.1.2](../../compare/1.1.1...1.1.2) (2016-12-28)
+
+- Throw \Exception if ```extra/composer-overload-cache-dir``` is not defined in composer.json
+- Write ```Creating dir``` when composer is called with -v
+- Write ```Foo.php is overloaded by Bar.php when``` composer is called with -v
+
+### [1.1.1 ](../../compare/1.1.0...1.1.1) (2016-11-19)
 
 - Create cache dir if not exists
 
-1.1.0 (2016-07-19)
-------------------
+### [1.1.0](../../compare/1.0.1...1.1.0) (2016-07-19)
 
-- Add extra/composer-overload-cache-dir-dev to set cache dir in dev
-- Add extra/composer-overload-class-dev to define classes to overload in dev
+- Add ```extra/composer-overload-cache-dir-dev``` to set cache dir in dev
+- Add ```extra/composer-overload-class-dev``` to define classes to overload in dev
 
-1.0.1 (2016-07-19)
-------------------
+### [1.0.1](../../compare/1.0.0...1.0.1) (2016-07-19)
 
 - Fix add use to ComposerOverloadClass
 
-1.0.0 (2016-07-17)
-------------------
+### 1.0.0 (2016-07-17)
 
-- Create ComposerOverloadClass
-- OverloadClass::overload() create a clone of original class, prefix it's namespace with ComposerOverloadClass, and add use if needed (only for extends class name)
+- Create ```ComposerOverloadClass```
+- ```OverloadClass::overload()``` create a clone of original class, prefix it's namespace with ```ComposerOverloadClass```, and add use if needed (only for extends class name)