diff --git a/app/code/Magento/Catalog/Model/ResourceModel/Eav/Attribute.php b/app/code/Magento/Catalog/Model/ResourceModel/Eav/Attribute.php
index f3984b4a35f1a..e1c90017327cd 100644
--- a/app/code/Magento/Catalog/Model/ResourceModel/Eav/Attribute.php
+++ b/app/code/Magento/Catalog/Model/ResourceModel/Eav/Attribute.php
@@ -395,7 +395,7 @@ public function getApplyTo()
     /**
      * Retrieve source model
      *
-     * @return \Magento\Eav\Model\Entity\Attribute\Source\AbstractSource
+     * @return \Magento\Eav\Model\Entity\Attribute\Source\AbstractSource|string|null
      */
     public function getSourceModel()
     {