diff --git a/core/update.php b/core/update.php
index db92c1a..c67b667 100644
--- a/core/update.php
+++ b/core/update.php
@@ -304,7 +304,11 @@ function update_info_page() {
   $output = '<p>Use this utility to update your database whenever a new release of Drupal or a module is installed.</p><p>For more detailed information, see the <a href="http://drupal.org/upgrade">upgrading handbook</a>. If you are unsure what these terms mean you should probably contact your hosting provider.</p>';
   $output .= "<ol>\n";
   $output .= "<li><strong>Back up your code</strong>. Hint: when backing up module code, do not leave that backup in the 'modules' or 'sites/*/modules' directories as this may confuse Drupal's auto-discovery mechanism.</li>\n";
-  $output .= '<li>Put your site into <a href="' . base_path() . '?q=admin/config/development/maintenance">maintenance mode</a>.</li>' . "\n";
+  if (\Drupal::state()->get('system.maintenance_mode')) {
+    $output .= '<li><strike>Your site is already in maintenance mode.</strike></li>' . "\n";
+  } else {
+    $output .= '<li>Put your site into <a href="' . base_path() . '?q=admin/config/development/maintenance">maintenance mode</a>.</li>' . "\n";
+  }
   $output .= "<li><strong>Back up your database</strong>. This process will change your database values and in case of emergency you may need to revert to a backup.</li>\n";
   $output .= "<li>Install your new files in the appropriate location, as described in the handbook.</li>\n";
   $output .= "</ol>\n";