diff --git a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemBrandingBlock.php b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemBrandingBlock.php
index 6336809..89f340c 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/Block/SystemBrandingBlock.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/Block/SystemBrandingBlock.php
@@ -85,16 +85,19 @@ public function blockForm($form, &$form_state) {
     $form['block_branding']['use_site_logo'] = array(
       '#type' => 'checkbox',
       '#title' => $this->t('Site logo'),
+      '#description' => $this->t('Defined in appearance or theme settings.'),
       '#default_value' => $this->configuration['use_site_logo'],
     );
     $form['block_branding']['use_site_name'] = array(
       '#type' => 'checkbox',
       '#title' => $this->t('Site name'),
+      '#description' => $this->t('Defined in site information settings.'),
       '#default_value' => $this->configuration['use_site_name'],
     );
     $form['block_branding']['use_site_slogan'] = array(
       '#type' => 'checkbox',
       '#title' => $this->t('Site slogan'),
+      '#description' => $this->t('Defined in site information settings.'),
       '#default_value' => $this->configuration['use_site_slogan'],
     );
     return $form;
diff --git a/core/modules/system/templates/branding.html.twig b/core/modules/system/templates/branding.html.twig
index 714f65c..7f3e5c6 100644
--- a/core/modules/system/templates/branding.html.twig
+++ b/core/modules/system/templates/branding.html.twig
@@ -7,7 +7,6 @@
  * - use_site_logo: Block setting on whether to show the site logo.
  * - use_site_name: Block setting on whether to show the site name.
  * - use_site_slogan: Block setting on whether to show the site slogan.
- *
  * - site_logo: Logo for site as defined in appearance or theme settings.
  * - site_name: Name for site as defined in site information settings.
  * - site_slogan: Slogan for site as defined in site information settings.