diff --git a/core/modules/simpletest/src/TestDiscovery.php b/core/modules/simpletest/src/TestDiscovery.php
index 62cc9d65ec..132694607c 100644
--- a/core/modules/simpletest/src/TestDiscovery.php
+++ b/core/modules/simpletest/src/TestDiscovery.php
@@ -209,7 +209,7 @@ public function getTestClasses($extension = NULL, array $types = []) {
     }
 
     // Allow modules extending core tests to disable originals.
-    $this->moduleHandler->alterDeprecated('Convert your test to a PHPUnit-based one and implement test listeners.', 'simpletest', $list);
+    $this->moduleHandler->alterDeprecated('Convert your test to a PHPUnit-based one and implement test listeners. See: https://www.drupal.org/node/2939892', 'simpletest', $list);
 
     if (!isset($extension) && empty($types)) {
       $this->testClasses = $list;
diff --git a/core/modules/simpletest/tests/src/Kernel/TestDiscoveryDeprecationTest.php b/core/modules/simpletest/tests/src/Kernel/TestDiscoveryDeprecationTest.php
index 984542fa26..6d4f44888a 100644
--- a/core/modules/simpletest/tests/src/Kernel/TestDiscoveryDeprecationTest.php
+++ b/core/modules/simpletest/tests/src/Kernel/TestDiscoveryDeprecationTest.php
@@ -18,7 +18,7 @@ class TestDiscoveryDeprecationTest extends KernelTestBase {
   public static $modules = ['simpletest', 'simpletest_deprecation_test'];
 
   /**
-   * @expectedDeprecation The deprecated alter hook hook_simpletest_alter() is implemented in these functions: simpletest_deprecation_test_simpletest_alter. Convert your test to a PHPUnit-based one and implement test listeners.
+   * @expectedDeprecation The deprecated alter hook hook_simpletest_alter() is implemented in these functions: simpletest_deprecation_test_simpletest_alter. Convert your test to a PHPUnit-based one and implement test listeners. See: https://www.drupal.org/node/2939892
    * @covers ::getTestClasses
    */
   public function testHookSimpletestAlter() {