diff --git a/core/modules/file/src/Element/ManagedFile.php b/core/modules/file/src/Element/ManagedFile.php
index a42c37c..cf8ec65 100644
--- a/core/modules/file/src/Element/ManagedFile.php
+++ b/core/modules/file/src/Element/ManagedFile.php
@@ -398,18 +398,22 @@ public static function preRenderManagedFile($element) {
    * Render API callback: Validates the managed_file element.
    */
   public static function validateManagedFile(&$element, FormStateInterface $form_state, &$complete_form) {
-    // If referencing an existing file, only allow if there are existing
-    // references. This prevents unmanaged files from being deleted if this
-    // item were to be deleted.
     $clicked_button = end($form_state->getTriggeringElement()['#parents']);
     if ($clicked_button != 'remove_button' && !empty($element['fids']['#value'])) {
       $fids = $element['fids']['#value'];
       foreach ($fids as $fid) {
         if ($file = File::load($fid)) {
-          // Issue @link https://www.drupal.org/node/2896480 @endlink disabled
-          // unused, but permanent, files from being garbage collected. We
-          // need to check the status here to see if we should check the
-          // reference count.
+          // If referencing an existing file, only allow if there are existing
+          // references. This prevents unmanaged files from being deleted if
+          // this item were to be deleted. When files that are no longer in use
+          // are automatically marked as temporary (now disabled by default),
+          // it is not safe to reference a permanent file without usage. Adding
+          // removing it again would delete the file, but it is unknown if and
+          // where it is currently referenced. However, when files are not
+          // marked temporary (and then removed) automatically, it is safe to
+          // add and remove usages, as it would simply return to the current
+          // state.
+          // @see https://www.drupal.org/node/2891902
           if ($file->isPermanent() && \Drupal::config('file.settings')->get('make_unused_managed_files_temporary')) {
             $references = static::fileUsage()->listUsage($file);
             if (empty($references)) {