diff --git a/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php b/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php
index 318eb94..1dba4fa 100644
--- a/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php
@@ -18,7 +18,8 @@
  * Additional modules needed in a test may be loaded and added to the fixed
  * module list.
  *
- * @deprecated since version 8.x-dev.Use \Drupal\simpletest\KerneltestBase
+ * @deprecated since version 8.x-dev, will be removed before Drupal 9.0.
+ * Use \Drupal\simpletest\KernelTestBase
  */
 abstract class DrupalUnitTestBase extends KernelTestBase {
 }