diff -u b/core/lib/Drupal/Core/SitePathFactory.php b/core/lib/Drupal/Core/SitePathFactory.php
--- b/core/lib/Drupal/Core/SitePathFactory.php
+++ b/core/lib/Drupal/Core/SitePathFactory.php
@@ -30,7 +30,7 @@
   }
 
   /**
-   * Gets the app root.
+   * Gets the site path.
    *
    * @return string
    *   The site path.