diff --git a/src/BidRequest/Source.php b/src/BidRequest/Source.php
index 1bda31e..c461638 100644
--- a/src/BidRequest/Source.php
+++ b/src/BidRequest/Source.php
@@ -44,6 +44,11 @@ class Source implements Arrayable
      */
     protected $pchain;
 
+    /**
+     * @var Ext
+     */
+    protected $ext;
+
     /**
      * @return bool
      */
@@ -107,6 +112,21 @@ public function setPchain($pchain)
         return $this;
     }
 
+    /**
+     * @return Ext
+     */
+    public function getExt()
+    {
+        return $this->ext;
+    }
 
-
+    /**
+     * @param Ext $ext
+     * @return $this
+     */
+    public function setExt(Ext $ext)
+    {
+        $this->ext = $ext;
+        return $this;
+    }
 }