diff --git a/core/modules/tour/src/Annotation/Tip.php b/core/modules/tour/src/Annotation/Tip.php
index 81ba032..3870ab6 100644
--- a/core/modules/tour/src/Annotation/Tip.php
+++ b/core/modules/tour/src/Annotation/Tip.php
@@ -12,6 +12,14 @@
 /**
  * Defines a Tip annotation object.
  *
+ * Plugin Namespace: Plugin\tour\tip
+ * For a working example, see \Drupal\tour\Plugin\tour\tip\TipPluginText
+ *
+ * @see \Drupal\tour\TipPluginBase
+ * @see \Drupal\tour\TipPluginInterface
+ * @see \Drupal\tour\TipPluginManager
+ * @see plugin_api
+ *
  * @Annotation
  */
 class Tip extends Plugin {
diff --git a/core/modules/tour/src/TipPluginBase.php b/core/modules/tour/src/TipPluginBase.php
index a35f931..df0438f 100644
--- a/core/modules/tour/src/TipPluginBase.php
+++ b/core/modules/tour/src/TipPluginBase.php
@@ -12,6 +12,11 @@
 
 /**
  * Defines a base tour implementation.
+ *
+ * @see \Drupal\tour\Annotation\Tip
+ * @see \Drupal\tour\TipPluginInterface
+ * @see \Drupal\tour\TipPluginManager
+ * @see plugin_api
  */
 abstract class TipPluginBase extends PluginBase implements TipPluginInterface {
 
diff --git a/core/modules/tour/src/TipPluginInterface.php b/core/modules/tour/src/TipPluginInterface.php
index bb89866..e5e52b8 100644
--- a/core/modules/tour/src/TipPluginInterface.php
+++ b/core/modules/tour/src/TipPluginInterface.php
@@ -9,6 +9,11 @@
 
 /**
  * Defines an interface for tour items.
+ *
+ * @see \Drupal\tour\Annotation\Tip
+ * @see \Drupal\tour\TipPluginBase
+ * @see \Drupal\tour\TipPluginManager
+ * @see plugin_api
  */
 interface TipPluginInterface {
 
diff --git a/core/modules/tour/src/TipPluginManager.php b/core/modules/tour/src/TipPluginManager.php
index bae4066..5f4f672 100644
--- a/core/modules/tour/src/TipPluginManager.php
+++ b/core/modules/tour/src/TipPluginManager.php
@@ -12,7 +12,12 @@
 use Drupal\Core\Plugin\DefaultPluginManager;
 
 /**
- * Configurable tour manager.
+ * Provides a tour manager.
+ *
+ * @see \Drupal\tour\Annotation\Tip
+ * @see \Drupal\tour\TipPluginBase
+ * @see \Drupal\tour\TipPluginInterface
+ * @see plugin_api
  */
 class TipPluginManager extends DefaultPluginManager {