diff --git a/wp-includes/class-wp-customize-setting.php b/wp-includes/class-wp-customize-setting.php
index 4cd54e5a30..bf75426a13 100644
--- a/wp-includes/class-wp-customize-setting.php
+++ b/wp-includes/class-wp-customize-setting.php
@@ -122,6 +122,15 @@ class WP_Customize_Setting {
 				}
 				break;
 			default :
+
+				/**
+				 * Fires when the WP_Customize_Setting::preview() method is called for settings
+				 * not handled as theme_mods or options.
+				 *
+				 * The dynamic portion of the hook name, $this->id, refers to the setting ID.
+				 *
+				 * @since 3.4.0
+				 */
 				do_action( 'customize_preview_' . $this->id );
 		}
 	}
@@ -153,6 +162,15 @@ class WP_Customize_Setting {
 		if ( ! $this->check_capabilities() || ! isset( $value ) )
 			return false;
 
+		/**
+		 * Fires when the WP_Customize_Setting::save() method is called for settings
+		 * not handled as theme_mods or options.
+		 *
+		 * The dynamic portion of the hook name, $this->id_data['base'] refers to
+		 * the base slug of the setting name.
+		 *
+		 * @since 3.4.0
+		 */
 		do_action( 'customize_save_' . $this->id_data[ 'base' ] );
 
 		$this->update( $value );
@@ -190,6 +208,15 @@ class WP_Customize_Setting {
 	 */
 	public function sanitize( $value ) {
 		$value = wp_unslash( $value );
+
+		/**
+		 * Filter a Customize setting value in un-slashed form.
+		 *
+		 * @since 3.4.0
+		 *
+		 * @param mixed                $value Value of the setting.
+		 * @param WP_Customize_Setting $this  WP_Customize_Setting instance.
+		 */
 		return apply_filters( "customize_sanitize_{$this->id}", $value, $this );
 	}
 
@@ -210,6 +237,17 @@ class WP_Customize_Setting {
 				return $this->_update_option( $value );
 				break;
 			default :
+
+				/**
+				 * Fires when the WP_Customize_Setting::update() method is called for settings
+				 * not handled as theme_mods or options.
+				 *
+				 * The dynamic portion of the hook name, $this->type, refers to the type of setting.
+				 *
+				 * @since 3.4.0
+				 *
+				 * @param mixed $value Value of the setting.
+				 */
 				return do_action( 'customize_update_' . $this->type, $value );
 		}
 	}
@@ -271,6 +309,20 @@ class WP_Customize_Setting {
 				$function = 'get_option';
 				break;
 			default :
+
+				/**
+				 * Filter a Customize setting value not handled as a theme_mod or option.
+				 *
+				 * The dynamic portion of the hook name, $this->id_date['base'], refers to
+				 * the base slug of the setting name.
+				 *
+				 * For settings handled as theme_mods or options, see those corresponding
+				 * functions for available hooks.
+				 *
+				 * @since 3.4.0
+				 *
+				 * @param mixed $default The setting default value. Default empty.
+				 */
 				return apply_filters( 'customize_value_' . $this->id_data[ 'base' ], $this->default );
 		}
 
@@ -291,6 +343,17 @@ class WP_Customize_Setting {
 	 * @return mixed The requested escaped value.
 	 */
 	public function js_value() {
+
+		/**
+		 * Filter a Customize setting value for use in JavaScript.
+		 *
+		 * The dynamic portion of the hook name, $this->id, refers to the setting ID.
+		 *
+		 * @since 3.4.0
+		 *
+		 * @param mixed                $value The setting value.
+		 * @param WP_Customize_Setting $this  WP_Customize_Setting instance.
+		 */
 		$value = apply_filters( "customize_sanitize_js_{$this->id}", $this->value(), $this );
 
 		if ( is_string( $value ) )