diff --git a/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Options/Option.php b/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Options/Option.php
index 3b1b57e353538a51a2f381ecac5159539b9b4986..7dbacd96990b59888da7ecccb736760b1836c5a4 100644
--- a/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Options/Option.php
+++ b/app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Options/Option.php
@@ -462,6 +462,11 @@ class Option extends Widget
         return $this->getUrl('catalog/*/customOptions');
     }
 
+    /**
+     * Return current product id
+     *
+     * @return null|int
+     */
     public function getCurrentProductId()
     {
         return $this->getProduct()->getId();