diff --git a/core/tests/Drupal/TestSite/Commands/TestSiteInstallCommand.php b/core/tests/Drupal/TestSite/Commands/TestSiteInstallCommand.php
index 5a939b6795..92f8cad759 100644
--- a/core/tests/Drupal/TestSite/Commands/TestSiteInstallCommand.php
+++ b/core/tests/Drupal/TestSite/Commands/TestSiteInstallCommand.php
@@ -65,7 +65,7 @@ class TestSiteInstallCommand extends Command {
   protected function configure() {
     $this->setName('install')
       ->setDescription('Creates a test Drupal site')
-      ->setHelp('The details to connect to the test site created will be displayed upon succes. It will contain the database prefix and the user agent.')
+      ->setHelp('The details to connect to the test site created will be displayed upon success. It will contain the database prefix and the user agent.')
       ->addOption('setup_class', NULL, InputOption::VALUE_OPTIONAL, 'A PHP class to setup configuration used by the test, for example, \Drupal\TestSite\TestSiteInstallTestScript')
       ->addOption('db_url', NULL, InputOption::VALUE_OPTIONAL, 'URL for database or SIMPLETEST_DB', getenv('SIMPLETEST_DB'))
       ->addOption('base_url', NULL, InputOption::VALUE_OPTIONAL, 'Base URL for site under test or SIMPLETEST_BASE_URL', getenv('SIMPLETEST_BASE_URL'))