diff --git a/src/Message.php b/src/Message.php
index 996419e..0efa365 100644
--- a/src/Message.php
+++ b/src/Message.php
@@ -19,7 +19,7 @@ class Message implements \JsonSerializable
     private $notification;
     private $collapseKey;    
     private $priority;
-    private $data;
+    private $data = [];
     private $recipients = [];
     private $recipientType;    
     private $jsonData;
@@ -71,7 +71,7 @@ public function setPriority($priority)
 
     public function setData(array $data)
     {
-        $this->data = $data;
+        $this->data = array_merge($this->data, $data);
         return $this;
     }
             
diff --git a/src/Notification.php b/src/Notification.php
index ad18565..28c171c 100644
--- a/src/Notification.php
+++ b/src/Notification.php
@@ -14,6 +14,7 @@ class Notification extends Message
     private $clickAction;
     private $tag;
     private $content_available;
+    private $image;
 
     public function __construct($title = '', $body = '')
     {
@@ -84,6 +85,12 @@ public function setContentAvailable($content_available)
         return $this;
     }
 
+    public function setImage($image)
+    {
+        $this->image = $image;
+        return $this;
+    }
+
     public function jsonSerialize()
     {
         $jsonData = $this->getJsonData();
@@ -111,6 +118,9 @@ public function jsonSerialize()
         if ($this->content_available) {
             $jsonData['content_available'] = $this->content_available;
         }        
+        if ($this->image) {
+            $jsonData['image'] = $this->image;
+        }        
         return $jsonData;
     }
 }