diff --git a/core/lib/Drupal/Core/Field/FieldItemInterface.php b/core/lib/Drupal/Core/Field/FieldItemInterface.php
index 8e3e52b9f48..37d0cbfa1b6 100644
--- a/core/lib/Drupal/Core/Field/FieldItemInterface.php
+++ b/core/lib/Drupal/Core/Field/FieldItemInterface.php
@@ -162,7 +162,7 @@ interface FieldItemInterface extends ComplexDataInterface {
   /**
    * Returns a renderable array for a single field item.
    *
-   * @param array $display_options
+   * @param string|array $display_options
    *   Can be either the name of a view mode, or an array of display settings.
    *   See EntityViewBuilderInterface::viewField() for more information.
    *
diff --git a/core/lib/Drupal/Core/Field/FieldItemListInterface.php b/core/lib/Drupal/Core/Field/FieldItemListInterface.php
index 5367f39fb41..d52834aace1 100644
--- a/core/lib/Drupal/Core/Field/FieldItemListInterface.php
+++ b/core/lib/Drupal/Core/Field/FieldItemListInterface.php
@@ -174,7 +174,7 @@ interface FieldItemListInterface extends ListInterface, AccessibleInterface {
   /**
    * Returns a renderable array for the field items.
    *
-   * @param array $display_options
+   * @param string|array $display_options
    *   Can be either the name of a view mode, or an array of display settings.
    *   See EntityViewBuilderInterface::viewField() for more information.
    *