diff --git a/core/lib/Drupal/Core/Path/AliasManager.php b/core/lib/Drupal/Core/Path/AliasManager.php
index 2e04097..9fe0e2c 100644
--- a/core/lib/Drupal/Core/Path/AliasManager.php
+++ b/core/lib/Drupal/Core/Path/AliasManager.php
@@ -12,6 +12,9 @@
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\Core\Language\LanguageManagerInterface;
 
+/**
+ * The default alias manager implementation.
+ */
 class AliasManager implements AliasManagerInterface, CacheDecoratorInterface {
 
   /**
diff --git a/core/lib/Drupal/Core/Path/AliasManagerInterface.php b/core/lib/Drupal/Core/Path/AliasManagerInterface.php
index 177d1a4..0803eeb 100644
--- a/core/lib/Drupal/Core/Path/AliasManagerInterface.php
+++ b/core/lib/Drupal/Core/Path/AliasManagerInterface.php
@@ -7,6 +7,11 @@
 
 namespace Drupal\Core\Path;
 
+/**
+ * Find an alias for a path and vice versa.
+ *
+ * @see \Drupal\Core\Path\AliasStorageInterface
+ */
 interface AliasManagerInterface {
 
   /**