diff --git a/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php b/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
index 3b3ecdaa3cb..58c83c8a473 100644
--- a/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
+++ b/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
@@ -241,7 +241,7 @@ class ClassMetadataInfo implements ClassMetadata
      * )
      * </code>
      *
-     * @var array
+     * @var array|null
      *
      * @todo Merge with tableGeneratorDefinition into generic generatorDefinition
      */