diff --git a/src/wp-includes/js/wp-embed.js b/src/wp-includes/js/wp-embed.js
index 985f0b8..9758829 100644
--- a/src/wp-includes/js/wp-embed.js
+++ b/src/wp-includes/js/wp-embed.js
@@ -1,3 +1,17 @@
+/**
+ * WordPress oembed service embed code
+ *
+ * The JavaScript portion of the embed template for the WordPress embed
+ * service.
+ *
+ * Note: this code should not contain the ampersand (&) character,
+ * including it can throw errors for manual embeds in WordPress 4.3.x
+ * and under.
+ *
+ * @see https://core.trac.wordpress.org/ticket/34698
+ *
+ * @since 4.4.0.
+ */
 (function ( window, document ) {
 	'use strict';