diff --git a/core/core.api.php b/core/core.api.php
index da88f70..802252b 100644
--- a/core/core.api.php
+++ b/core/core.api.php
@@ -1142,12 +1142,15 @@
  *   subset of the functionality. Each method runs in a new, isolated test
  *   environment, so it can only rely on the setUp() method, not what has
  *   been set up by other test methods.
+ * For more details, see:
+ * - https://www.drupal.org/docs/8/phpunit/phpunit-browser-test-tutorial for
+ *   a full tutorial on how to write functional PHPUnit tests for Drupal.
  *
  * @section write_jsfunctional_phpunit Write functional JavaScript tests (phpunit)
  * To write a functional test that relies on JavaScript:
  * - Extend \Drupal\FunctionalJavaScriptTests\JavascriptTestBase.
  * - Place the test into the yourmodule/tests/src/FunctionalJavascript/
- *   directory and use the Drupal\Tests\yourmodule\FunctionalJavascript/
+ *   directory and use the Drupal\Tests\yourmodule\FunctionalJavascript\
  *   namespace.
  * - Add a @group annotation. Use yourmodule as the group name if the test does
  *   not belong to another larger group.