diff --git a/core/lib/Drupal/Component/Utility/NestedArray.php b/core/lib/Drupal/Component/Utility/NestedArray.php
index c494c24e900..e123b4adbb9 100644
--- a/core/lib/Drupal/Component/Utility/NestedArray.php
+++ b/core/lib/Drupal/Component/Utility/NestedArray.php
@@ -291,10 +291,6 @@ class NestedArray {
    * @param array ...
    *   Arrays to merge.
    *
-   * @param bool $preserve_integer_keys
-   *   (optional) If given, integer keys will be preserved and merged instead of
-   *   appended.
-   *
    * @return array
    *   The merged array.
    *
@@ -319,6 +315,15 @@ class NestedArray {
    * - call_user_func_array('NestedArray::mergeDeep', $arrays_to_merge);
    * - NestedArray::mergeDeepArray($arrays_to_merge);
    *
+   * @param array $arrays
+   *   An arrays of arrays to merge.
+   * @param bool $preserve_integer_keys
+   *   (optional) If given, integer keys will be preserved and merged instead of
+   *   appended. Defaults to FALSE.
+   *
+   * @return array
+   *   The merged array.
+   *
    * @see NestedArray::mergeDeep()
    */
   public static function mergeDeepArray(array $arrays, $preserve_integer_keys = FALSE) {