diff --git a/core/modules/toolbar/js/escapeAdmin.js b/core/modules/toolbar/js/escapeAdmin.js
index 0ffc31e..26b8a26 100644
--- a/core/modules/toolbar/js/escapeAdmin.js
+++ b/core/modules/toolbar/js/escapeAdmin.js
@@ -26,6 +26,9 @@
    * visited within the same browser tab.
    *
    * @type {Drupal~behavior}
+   *
+   * @prop {Drupal~behaviorAttach} attach
+   *   Attaches the replacement functionality to the toolbar-escape-admin element.
    */
   Drupal.behaviors.escapeAdmin = {
     attach: function () {
diff --git a/core/modules/toolbar/js/toolbar.js b/core/modules/toolbar/js/toolbar.js
index 73b563f..9a19205 100644
--- a/core/modules/toolbar/js/toolbar.js
+++ b/core/modules/toolbar/js/toolbar.js
@@ -35,6 +35,9 @@
    * Modules register tabs with hook_toolbar().
    *
    * @type {Drupal~behavior}
+   *
+   * @prop {Drupal~behaviorAttach} attach
+   *   Attaches the toolbar rendering functionality to the toolbar element.
    */
   Drupal.behaviors.toolbar = {
     attach: function (context) {