diff --git a/modules/cms/classes/CmsObject.php b/modules/cms/classes/CmsObject.php
index 766f3726c..eb4e73e5f 100644
--- a/modules/cms/classes/CmsObject.php
+++ b/modules/cms/classes/CmsObject.php
@@ -37,6 +37,13 @@ class CmsObject extends HalcyonModel implements CmsObjectContract
      */
     public $customMessages = [];
 
+    /**
+     * @var int The maximum allowed path nesting level. The default value is 2,
+     * meaning that files can only exist in the root directory, or in a
+     * subdirectory. Set to null if any level is allowed.
+     */
+    protected $maxNesting = null;
+
     /**
      * @var array The attributes that are mass assignable.
      */