diff --git a/core/modules/config/src/Form/ConfigImportForm.php b/core/modules/config/src/Form/ConfigImportForm.php
index 85618cb..8d22299 100644
--- a/core/modules/config/src/Form/ConfigImportForm.php
+++ b/core/modules/config/src/Form/ConfigImportForm.php
@@ -55,10 +55,13 @@ public function getFormId() {
    * {@inheritdoc}
    */
   public function buildForm(array $form, FormStateInterface $form_state) {
+    $form['description'] = array(
+      '#markup' => '<p>' . $this->t('Use the upload button below.') . '</p>',
+    );
     $form['import_tarball'] = array(
       '#type' => 'file',
       '#title' => $this->t('Configuration archive'),
-      '#description' => $this->t('Allowed types: @extensions.', array('@extensions' => 'tar.gz tgz')),
+      '#description' => $this->t('Allowed types: @extensions.', array('@extensions' => 'tar.gz tgz tar.bz2')),
     );
 
     $form['submit'] = array(