diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 18395a5..6d72a7f 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -41,7 +41,7 @@ class Configuration implements ConfigurationInterface
                 ->scalarNode('distortion')->defaultValue(true)->end()
                 ->scalarNode('max_front_lines')->defaultValue(null)->end()
                 ->scalarNode('max_behind_lines')->defaultValue(null)->end()
-                ->arrayNode('backgroundColor')->prototype('scalar')->end()
+                ->arrayNode('background_color')->prototype('scalar')->end()
             ->end()
         ;
 
diff --git a/Generator/CaptchaGenerator.php b/Generator/CaptchaGenerator.php
index 900b756..4da833a 100644
--- a/Generator/CaptchaGenerator.php
+++ b/Generator/CaptchaGenerator.php
@@ -98,12 +98,12 @@ class CaptchaGenerator
         $this->builder->setMaxFrontLines($options['max_front_lines']);
         $this->builder->setMaxBehindLines($options['max_behind_lines']);
 
-        if ($options['backgroundColor'] != array()) {
-            if (count($options['backgroundColor'])!=3) {
-                throw new \RuntimeException('backgroundColor should be an array of r, g and b');
+        if ($options['background_color'] != array()) {
+            if (count($options['background_color'])!=3) {
+                throw new \RuntimeException('background_color should be an array of r, g and b');
             }
 
-            $color = $options['backgroundColor'];
+            $color = $options['background_color'];
             $this->builder->setBackgroundColor($color[0], $color[1], $color[2]);
         }
 
diff --git a/README.md b/README.md
index 75610d1..907ecb6 100644
--- a/README.md
+++ b/README.md
@@ -138,6 +138,7 @@ You can define the following configuration options globally or on the CaptchaTyp
 * **distortion**: enable or disable the distortion on the image (default=true, enabled)
 * **max_front_lines**, **max_behind_lines**: the maximum number of lines to draw on top/behind the image. `0` will draw no lines; `null` will use the default algorithm (the
 number of lines depends on the size of the image). (default=null)
+* **background_color**: sets the background color, if you want to force it, this should be an array of r,g &b, for instance [255, 255, 255] will force the background to be white
 
 Example :
 
diff --git a/composer.json b/composer.json
index 2e2b0ce..9b80a7d 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
     ],
     "require": {
         "php": ">=5.3.0",
-        "gregwar/captcha": "v1.0.3"
+        "gregwar/captcha": "v1.0.4"
     },
     "autoload": {
         "psr-0": {