diff --git a/core/modules/system/src/Form/FileSystemForm.php b/core/modules/system/src/Form/FileSystemForm.php
index 54ef2cd..c4943f8 100644
--- a/core/modules/system/src/Form/FileSystemForm.php
+++ b/core/modules/system/src/Form/FileSystemForm.php
@@ -100,7 +100,9 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#type' => 'item',
       '#title' => t('Private file system path'),
       '#markup' => (PrivateStream::basePath() ? PrivateStream::basePath() : t('Not set')),
-      '#description' => t('An existing local file system path for storing private files. It should be writable by Drupal and not accessible over the web. This must be changed in settings.php'),
+      '#description' => t('An existing local file system path for storing private files. It should be writable by Drupal and not accessible over the web. This must be changed in settings.php. The Drupal root directory is @root.', array(
+          '@root' => DRUPAL_ROOT,
+        )),
     );
 
     $form['file_temporary_path'] = array(