diff --git a/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php b/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php
index cef558496..4b43e3070 100644
--- a/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php
+++ b/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php
@@ -50,7 +50,7 @@ class ClassMetadataFactory implements ClassMetadataFactoryInterface
     private $targetPlatform;
 
     /**
-     * @var Driver\Driver
+     * @var \Doctrine\ORM\Mapping\Driver\Driver
      */
     private $driver;
 
@@ -481,4 +481,15 @@ class ClassMetadataFactory implements ClassMetadataFactoryInterface
                 throw new ORMException("Unknown generator type: " . $class->generatorType);
         }
     }
+
+    /**
+     * Check if this class is mapped by this EntityManager + ClassMetadata configuration
+     *
+     * @param $class
+     * @return bool
+     */
+    public function isTransient($class)
+    {
+        return $this->driver->isTransient($class);
+    }
 }