diff --git a/core/lib/Drupal/Core/Path/Path.php b/core/lib/Drupal/Core/Path/Path.php
index 285d189..b025339 100644
--- a/core/lib/Drupal/Core/Path/Path.php
+++ b/core/lib/Drupal/Core/Path/Path.php
@@ -109,15 +109,7 @@ public function delete($conditions) {
   }
 
   /**
-   * Preloads path alias information for a given list of source paths.
-   *
-   * @param $path
-   *   The path to investigate for corresponding aliases.
-   * @param $langcode
-   *   Language code to search the path with. If there's no path defined for
-   *   that language it will search paths without language.
-   * @return array
-   *   Source (keys) to alias (values) mapping.
+   * {@inheritdoc}
    */
   public function preloadPathAlias($preloaded, $langcode) {
     $args = array(
@@ -148,16 +140,7 @@ public function preloadPathAlias($preloaded, $langcode) {
   }
 
   /**
-   * Returns an alias of Drupal system URL.
-   *
-   * @param string $path
-   *   The path to investigate for corresponding path aliases.
-   * @param string $langcode
-   *   Language code to search the path with. If there's no path defined for
-   *   that language it will search paths without language.
-   *
-   * @return string|bool
-   *   A path alias, or FALSE if no path was found.
+   * {@inheritdoc}
    */
   public function lookupPathAlias($path, $langcode) {
     $args = array(
@@ -181,16 +164,7 @@ public function lookupPathAlias($path, $langcode) {
   }
 
   /**
-   * Returns Drupal system URL of an alias.
-   *
-   * @param string $path
-   *   The path to investigate for corresponding system URLs.
-   * @param string $langcode
-   *   Language code to search the path with. If there's no path defined for
-   *   that language it will search paths without language.
-   *
-   * @return string|bool
-   *   A Drupal system path, or FALSE if no path was found.
+   * {@inheritdoc}
    */
   public function lookupPathSource($path, $langcode) {
     $args = array(
diff --git a/core/lib/Drupal/Core/Path/PathInterface.php b/core/lib/Drupal/Core/Path/PathInterface.php
index 22c696c..b24329a 100644
--- a/core/lib/Drupal/Core/Path/PathInterface.php
+++ b/core/lib/Drupal/Core/Path/PathInterface.php
@@ -57,4 +57,45 @@ public function load($conditions);
    *   An array of criteria.
    */
   public function delete($conditions);
+
+  /**
+   * Preloads path alias information for a given list of source paths.
+   *
+   * @param $path
+   *   The path to investigate for corresponding aliases.
+   * @param $langcode
+   *   Language code to search the path with. If there's no path defined for
+   *   that language it will search paths without language.
+   * @return array
+   *   Source (keys) to alias (values) mapping.
+   */
+  public function preloadPathAlias($preloaded, $langcode);
+
+  /**
+   * Returns an alias of Drupal system URL.
+   *
+   * @param string $path
+   *   The path to investigate for corresponding path aliases.
+   * @param string $langcode
+   *   Language code to search the path with. If there's no path defined for
+   *   that language it will search paths without language.
+   *
+   * @return string|bool
+   *   A path alias, or FALSE if no path was found.
+   */
+  public function lookupPathAlias($path, $langcode);
+
+  /**
+   * Returns Drupal system URL of an alias.
+   *
+   * @param string $path
+   *   The path to investigate for corresponding system URLs.
+   * @param string $langcode
+   *   Language code to search the path with. If there's no path defined for
+   *   that language it will search paths without language.
+   *
+   * @return string|bool
+   *   A Drupal system path, or FALSE if no path was found.
+   */
+  public function lookupPathSource($path, $langcode);
 }