diff --git a/core/tests/Drupal/FunctionalJavascriptTests/Ajax/MessageCommandTest.php b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/MessageCommandTest.php
index c9fe915d97..22cbbab76e 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/Ajax/MessageCommandTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/MessageCommandTest.php
@@ -111,10 +111,10 @@ protected function assertAnnounceContains($expected_message) {
   }
 
   /**
-   * Checks for inclusion of text in #drupal-live-announce.
+   * Checks for absence of the given text from #drupal-live-announce.
    *
    * @param string $expected_message
-   *   The text expected to be present in #drupal-live-announce.
+   *   The text expected to be absent from #drupal-live-announce.
    */
   protected function assertAnnounceNotContains($expected_message) {
     $assert_session = $this->assertSession();