diff --git a/core/lib/Drupal/Core/Path/AliasStorageInterface.php b/core/lib/Drupal/Core/Path/AliasStorageInterface.php
index 559972d..74360a8 100644
--- a/core/lib/Drupal/Core/Path/AliasStorageInterface.php
+++ b/core/lib/Drupal/Core/Path/AliasStorageInterface.php
@@ -63,6 +63,10 @@ public function load($pid);
    * @return mixed[]|bool
    *   FALSE if no alias was found or an associative array containing the
    *   following keys:
+   *   - source (string): The internal system path.
+   *   - alias (string): The URL alias.
+   *   - pid (int): Unique path alias identifier.
+   *   - langcode (string): The language code of the alias.
    */
   public function loadByPath($path, $langcode = NULL);
 
@@ -77,6 +81,10 @@ public function loadByPath($path, $langcode = NULL);
    * @return mixed[]|bool
    *   FALSE if no alias was found or an associative array containing the
    *   following keys:
+   *   - source (string): The internal system path.
+   *   - alias (string): The URL alias.
+   *   - pid (int): Unique path alias identifier.
+   *   - langcode (string): The language code of the alias.
    */
   public function loadByAlias($alias, $langcode = NULL);