diff --git a/Block/Adminhtml/System/Config/Form/Field/Type.php b/Block/Adminhtml/System/Config/Form/Field/Type.php
new file mode 100644
index 0000000..4fdecac
--- /dev/null
+++ b/Block/Adminhtml/System/Config/Form/Field/Type.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace Opengento\Logger\Block\Adminhtml\System\Config\Form\Field;
+
+class Type extends \Magento\Config\Block\System\Config\Form\Field\FieldArray\AbstractFieldArray
+{
+
+    /**
+     * @var \Magento\Framework\Data\Form\Element\Factory
+     */
+    protected $_elementFactory;
+
+    /**
+     * @param \Magento\Backend\Block\Template\Context $context
+     * @param \Magento\Framework\Data\Form\Element\Factory $elementFactory
+     * @param array $data
+     */
+    public function __construct(
+        \Magento\Backend\Block\Template\Context $context,
+        \Magento\Framework\Data\Form\Element\Factory $elementFactory,
+        array $data = []
+    ) {
+        $this->_elementFactory = $elementFactory;
+        parent::__construct($context, $data);
+    }
+
+    /**
+     * Initialise form fields
+     *
+     * @return void
+     */
+    protected function _construct()
+    {
+        $this->addColumn('custom_logger_key', ['label' => __('Logger key')]);
+        $this->addColumn('custom_logger_value', ['label' => __('Logger value')]);
+        $this->_addAfter = false;
+        $this->_addButtonLabel = __('Add');
+        parent::_construct();
+    }
+}
diff --git a/Config/Config.php b/Config/Config.php
new file mode 100644
index 0000000..4de753b
--- /dev/null
+++ b/Config/Config.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace Opengento\Logger\Config;
+
+use \Magento\Framework\App\Helper\AbstractHelper;
+
+/**
+ * Class Config
+ * @package Opengento\Logger\Config
+ */
+class Config extends AbstractHelper
+{
+    /** Config keys */
+    const CONFIG_LOGGER_CUSTOM_CONFIGURATION = 'loggin/loggin/types_logger';
+}
\ No newline at end of file
diff --git a/Config/CustomConfiguration.php b/Config/CustomConfiguration.php
new file mode 100644
index 0000000..de9e322
--- /dev/null
+++ b/Config/CustomConfiguration.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Opengento\Logger\Config;
+
+/**
+ * Class CustomConfiguration
+ */
+class CustomConfiguration
+{
+    /**
+     * @var \Magento\Framework\App\Config\ScopeConfigInterface
+     */
+    private $scopeConfig;
+
+    /**
+     * @var \Magento\Framework\Serialize\Serializer\Json
+     */
+    private $serializer;
+
+
+    /**
+     * CustomFields constructor.
+     * @param \Magento\Framework\App\Helper\Context $context
+     * @param \Magento\Framework\Serialize\Serializer\Json $serializer
+     */
+    public function __construct(\Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig, \Magento\Framework\Serialize\Serializer\Json $serializer)
+    {
+        $this->scopeConfig = $scopeConfig;
+        $this->serializer = $serializer;
+    }
+
+    /**
+     * @param $configPath
+     * @param null $store
+     * @return mixed
+     */
+    public function getConfigValue($configPath, $store = null){
+        return $this->scopeConfig->getValue(
+            $configPath,
+            \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
+            $store
+        );
+    }
+
+    /**
+     * @param $configPath
+     * @param null $store
+     * @return array|bool|float|int|mixed|string|null
+     */
+    public function getUnserializedConfigValue($configPath, $store = null){
+        $value = $this->getConfigValue($configPath, $store);
+
+        if(!$value) return false;
+
+        return $this->serializer->unserialize($value);
+    }
+}
\ No newline at end of file
diff --git a/Publisher/GelfPublisherWrapper.php b/Publisher/GelfPublisherWrapper.php
index afcc5f8..55d5298 100644
--- a/Publisher/GelfPublisherWrapper.php
+++ b/Publisher/GelfPublisherWrapper.php
@@ -3,10 +3,13 @@
  * Copyright © OpenGento, All rights reserved.
  * See LICENSE bundled with this library for license details.
  */
+
 namespace Opengento\Logger\Publisher;
 
 use Gelf\MessageInterface;
 use Gelf\PublisherInterface;
+use Opengento\Logger\Config\CustomConfiguration;
+use Opengento\Logger\Config\Config;
 
 /**
  * Class GelfPublisherWrapper
@@ -20,8 +23,19 @@ class GelfPublisherWrapper implements PublisherInterface
      */
     private $publisher;
 
-    public function __construct(PublisherInterface $publisher)
+    /**
+     * @var CustomConfiguration
+     */
+    private $customConfiguration;
+
+    /**
+     * GelfPublisherWrapper constructor.
+     * @param PublisherInterface $publisher
+     * @param CustomConfiguration $customConfiguration
+     */
+    public function __construct(PublisherInterface $publisher, CustomConfiguration $customConfiguration)
     {
+        $this->customConfiguration = $customConfiguration;
         $this->publisher = $publisher;
     }
 
@@ -34,6 +48,22 @@ public function __construct(PublisherInterface $publisher)
      */
     public function publish(MessageInterface $message)
     {
+        $this->joinCustomConfiguration($message);
+
         return $this->publisher->publish($message);
     }
+
+    /**
+     * @param MessageInterface $message
+     */
+    public function joinCustomConfiguration(MessageInterface $message)
+    {
+        $customConfiguration = $this->customConfiguration->getUnserializedConfigValue(Config::CONFIG_LOGGER_CUSTOM_CONFIGURATION);
+
+        if(!$customConfiguration) return;
+
+        foreach ($customConfiguration as $value) {
+            $message->setAdditional($value['custom_logger_key'], $value['custom_logger_value']);
+        }
+    }
 }
diff --git a/composer.json b/composer.json
index 0246278..47acc33 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         "graylog2/gelf-php": "^1.6"
     },
     "type": "magento2-module",
-    "version": "0.1.0",
+    "version": "0.2.0",
     "license": [
         "MIT"
     ],
diff --git a/etc/adminhtml/system.xml b/etc/adminhtml/system.xml
index a7ff1b3..92f8147 100644
--- a/etc/adminhtml/system.xml
+++ b/etc/adminhtml/system.xml
@@ -29,6 +29,12 @@
                     <label>Gelf transport port</label>
                     <comment/>
                 </field>
+                <field id="types_logger" translate="label" type="text" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
+                    <label>Custom configuration</label>
+                    <frontend_model>Opengento\Logger\Block\Adminhtml\System\Config\Form\Field\Type</frontend_model>
+                    <backend_model>Magento\Config\Model\Config\Backend\Serialized\ArraySerialized</backend_model>
+                    <comment>Add key with custom value</comment>
+                </field>
             </group>
         </section>
     </system>
diff --git a/etc/di.xml b/etc/di.xml
index 7768da4..b587a21 100644
--- a/etc/di.xml
+++ b/etc/di.xml
@@ -21,9 +21,15 @@
         </arguments>
     </virtualType>
 
-    <virtualType name="SimpleGelfHandler" type="Opengento\Logger\Handler\GelfHandlerWrapper">
+    <virtualType name="gelfPublisherWrapper" type="Opengento\Logger\Publisher\GelfPublisherWrapper" >
         <arguments>
             <argument name="publisher" xsi:type="object">gelfPublisher</argument>
+        </arguments>
+    </virtualType>
+
+    <virtualType name="SimpleGelfHandler" type="Opengento\Logger\Handler\GelfHandlerWrapper">
+        <arguments>
+            <argument name="publisher" xsi:type="object">gelfPublisherWrapper</argument>
             <argument name="level" xsi:type="init_parameter">Monolog\Logger::INFO</argument>
         </arguments>
     </virtualType>
diff --git a/i18n/fr_FR.csv b/i18n/fr_FR.csv
new file mode 100644
index 0000000..407650c
--- /dev/null
+++ b/i18n/fr_FR.csv
@@ -0,0 +1,7 @@
+"Enable ?", "Activé ?"
+"Gelf transport host", "Gelf transport host"
+"Gelf transport port", "Gelf transport port"
+"Custom configuration", "Configuration personnalisée"
+"Add key with custom value", "Ajoute une clé avec des valeurs personnalisées"
+"Logger key", "Logger key"
+"Logger value", "Logger value"
\ No newline at end of file