diff --git a/README.md b/README.md
index 3c15f83..6b724c0 100644
--- a/README.md
+++ b/README.md
@@ -1,19 +1,20 @@
-#php qr decoder 
-> php识别二维码, 不需要安装扩展 从哪里弄来的我也忘了，毕竟好几年了
+## PHP QR Decoder 
 
-### 安装
-`composer require zxing/qr-reader`
+### How to install
+`composer require thiagolp90/qr-reader`
 
-### 使用
+> this package is a fork of `zxing/qr-reader` to fix a bug when reading file using GD
+
+### How to use
 ```
 include __DIR__.'/vendor/autoload.php';
 
-$qrcode = new \Zxing\QrReader('./qr.png');  //图片路径
-$text = $qrcode->text(); //返回识别后的文本
+$qrcode = new \Zxing\QrReader('./qr.png');  //Image path
+$text = $qrcode->text(); //Return text 
 echo $text;
 ```
 
-### 需要
+### Requirements
 ```
 PHP >= 5.3
 GD Library
diff --git a/composer.json b/composer.json
index 3e60bb7..3ded10a 100644
--- a/composer.json
+++ b/composer.json
@@ -1,5 +1,5 @@
 {
-    "name": "zxing/qr-reader",
+    "name": "thiagolp90/qr-reader",
     "description": "PHP qr code reader library",
     "keywords": [
         "php",
diff --git a/lib/GDLuminanceSource.php b/lib/GDLuminanceSource.php
index 9b9b9af..af872be 100644
--- a/lib/GDLuminanceSource.php
+++ b/lib/GDLuminanceSource.php
@@ -51,7 +51,7 @@ public function GDLuminanceSource($gdImage, $width, $height)
         $this->dataHeight = $height;
         $this->left = 0;
         $this->top = 0;
-        $this->$gdImage = $gdImage;
+        $this->gdImage = $gdImage;
 
 
 // In order to measure pure decoding speed, we convert the entire image to a greyscale array
@@ -64,8 +64,8 @@ public function GDLuminanceSource($gdImage, $width, $height)
 
 for($j=0;$j<$height;$j++){
     for($i=0;$i<$width;$i++){
-        $argb = imagecolorat($this->$gdImage, $i, $j);
-        $pixel = imagecolorsforindex($this->$gdImage, $argb);
+        $argb = imagecolorat($this->gdImage, $i, $j);
+        $pixel = imagecolorsforindex($this->gdImage, $argb);
         $r = $pixel['red'];
         $g = $pixel['green'];
         $b = $pixel['blue'];