diff --git a/src/wp-admin/js/customize-controls.js b/src/wp-admin/js/customize-controls.js
index 5987bf4..a0eeec4 100644
--- a/src/wp-admin/js/customize-controls.js
+++ b/src/wp-admin/js/customize-controls.js
@@ -3381,9 +3381,41 @@
 	// Change objects contained within the main customize object to Settings.
 	api.defaultConstructor = api.Setting;
 
-	// Create the collections for Controls, Sections and Panels.
+	/**
+	 * Get instance of control by ID
+	 * All controls' instances in _values property (object) with control ID as property
+	 *
+	 * @param {string} id ID of control
+	 * @return {object|undefined} Control object or undefined
+	 *
+	 * @example wp.customize.control('background_color') Getting `background_color` control object
+	 * @example wp.customize.control('background_color').setting.get() Getting `background_color` value
+	 * @example wp.customize.control('background_color').setting.set( '#f00' ) Setting `background_color` to red
+	 */
 	api.control = new api.Values({ defaultConstructor: api.Control });
+
+	/**
+	 * Get instance of section by ID
+	 * All controls' instances in _values property (object) with control ID as property
+	 *
+	 * @param {string} ID of section
+	 * @return {object|undefined} Section object or undefined
+	 *
+	 * @example wp.customize.section('title_tagline') Getting `title_tagline` section object
+	 * @example wp.customize.section('title_tagline').expand() Expanding (Entering) `title_tagline` section
+	 */
 	api.section = new api.Values({ defaultConstructor: api.Section });
+
+	/**
+	 * Get instance of panel by ID
+	 * All panels' instances in _values property (object) with panel ID as property
+	 *
+	 * @param {string} id ID of panel
+	 * @return {object|undefined} Panel object or undefined
+	 *
+	 * @example wp.customize.panel('nav_menus') Getting nav_menus panel object
+	 * @example wp.customize.panel('nav_menus').expand() Expand (enter) nav_menus panel
+	 */
 	api.panel = new api.Values({ defaultConstructor: api.Panel });
 
 	/**