diff -u b/core/modules/views/src/Plugin/views/row/RssFields.php b/core/modules/views/src/Plugin/views/row/RssFields.php
--- b/core/modules/views/src/Plugin/views/row/RssFields.php
+++ b/core/modules/views/src/Plugin/views/row/RssFields.php
@@ -199,9 +199,8 @@
    *   The ID assigned to the required field in the display.
    *
    * @return string|null|\Drupal\Component\Render\MarkupInterface
-   *   It returns an empty string if there is no style plugin, or the field_id
-   *   is empty. And it returns a NULL if the field is actually empty otherwise
-   *   it returns a MarkupInterface object[the rendered field value].
+   *   An empty string if there is no style plugin, or the field ID is empty.
+   *   And NULL if the field is actually empty otherwise MarkupInterface object.
    */
   public function getField($index, $field_id) {
     if (empty($this->view->style_plugin) || !is_object($this->view->style_plugin) || empty($field_id)) {