diff --git a/core/modules/simpletest/src/RandomGeneratorTrait.php b/core/modules/simpletest/src/RandomGeneratorTrait.php
index 5a50439..ab86f69 100644
--- a/core/modules/simpletest/src/RandomGeneratorTrait.php
+++ b/core/modules/simpletest/src/RandomGeneratorTrait.php
@@ -71,16 +71,19 @@ public function randomStringValidate($string) {
     if (preg_match('/\s{2,}/', $string)) {
       return FALSE;
     }
+
     // Starting with a space means that length might not be what is expected.
     // Starting with an @ sign causes CURL to fail if used in conjunction with a
-    // file upload, see https://drupal.org/node/2174997.
+    // file upload. See https://www.drupal.org/node/2174997.
     if (preg_match('/^(\s|@)/', $string)) {
       return FALSE;
     }
+
     // Ending with a space means that length might not be what is expected.
     if (preg_match('/\s$/', $string)) {
       return FALSE;
     }
+
     return TRUE;
   }