diff --git a/boot.php b/boot.php
index a8b998fe1..a069dcafc 100644
--- a/boot.php
+++ b/boot.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * @file_tag_unsave_file boot.php
+ * @file boot.php
  * This file defines some global constants and includes the central App class.
  */
 
@@ -21,6 +21,7 @@ require_once __DIR__ . DIRECTORY_SEPARATOR . 'vendor' . DIRECTORY_SEPARATOR . 'a
 
 use Friendica\App;
 use Friendica\Core\Addon;
+use Friendica\Core\Cache;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Core\PConfig;
@@ -119,6 +120,24 @@ define('LOGGER_DATA',            3);
 define('LOGGER_ALL',             4);
 /* @}*/
 
+/**
+ * @name Cache
+ * @deprecated since version 3.6
+ * @see Cache
+ *
+ * Cache levels
+ * @{
+ */
+define('CACHE_MONTH',            Cache::MONTH);
+define('CACHE_WEEK',             Cache::WEEK);
+define('CACHE_DAY',              Cache::DAY);
+define('CACHE_HOUR',             Cache::HOUR);
+define('CACHE_HALF_HOUR',        Cache::HALF_HOUR);
+define('CACHE_QUARTER_HOUR',     Cache::QUARTER_HOUR);
+define('CACHE_FIVE_MINUTES',     Cache::FIVE_MINUTES);
+define('CACHE_MINUTE',           Cache::MINUTE);
+/* @}*/
+
 /**
  * @name Register
  *