Index: src/js/_enqueues/admin/link.js
===================================================================
--- src/js/_enqueues/admin/link.js	(revision 43342)
+++ src/js/_enqueues/admin/link.js	(working copy)
@@ -1,5 +1,12 @@
 /* global postboxes, deleteUserSetting, setUserSetting, getUserSetting */
 
+/**
+ * Binds to the document ready event.
+ *
+ * @since 2.5.0
+ *
+ * @param {jQuery} $ The jQuery object.
+ */
 jQuery(document).ready( function($) {
 
 	var newCat, noSyncChecks = false, syncChecks, catAddAfter;
@@ -8,7 +15,14 @@
 	// postboxes
 	postboxes.add_postbox_toggles('link');
 
-	// category tabs
+	/**
+	 * Adds event that opens a particular category tab.
+	 *
+	 * @listens $('#category-tabs a'):click
+	 *
+	 * @param {Event} event The event object.
+	 * @returns {Boolean} False, prevents regular link functionality.
+	 */
 	$('#category-tabs a').click(function(){
 		var t = $(this).attr('href');
 		$(this).parent().addClass('tabs').siblings('li').removeClass('tabs');
@@ -25,7 +39,21 @@
 
 	// Ajax Cat
 	newCat = $('#newcat').one( 'focus', function() { $(this).val( '' ).removeClass( 'form-input-tip' ); } );
+
+	/**
+	 * After adding a new category, focus on the category add input field.
+	 *
+	 * @listens $('#link-category-add-submit'):click
+	 *
+	 * @return {void}
+	 */
 	$('#link-category-add-submit').click( function() { newCat.focus(); } );
+
+	/**
+	 * Syncronize category checkboxes.
+	 *
+	 * @return {void}
+	 */
 	syncChecks = function() {
 		if ( noSyncChecks )
 			return;
@@ -35,6 +63,14 @@
 		noSyncChecks = false;
 	};
 
+	/**
+	 * Callback that's run after an item got added to the list.
+	 *
+	 * @param {XML} r Raw response returned from the server.
+	 * @param {Object} s List manager configuration object; settings for the Ajax request.
+	 *
+	 * @return {void}
+	 */
 	catAddAfter = function( r, s ) {
 		$(s.what + ' response_data', r).each( function() {
 			var t = $($(this).text());
@@ -46,18 +82,59 @@
 		} );
 	};
 
+	/**
+	 * List manager.
+	 *
+	 * @param {Object} List manager configuration object.
+	 *
+	 * @see wp-includes/js/wp-lists.js
+	 *
+	 * @type {wpList}
+	 */
 	$('#categorychecklist').wpList( {
+		// CSS class name for alternate styling.
 		alt: '',
+
+		// The type of list.
 		what: 'link-category',
+
+		// ID of the element the parsed Ajax response will be stored in.
 		response: 'category-ajax-response',
+
+		// Callback that's run after an item got added to the list.
 		addAfter: catAddAfter
 	} );
 
+	/**
+	 * Delete the user setting regarding which category tab should be shown.
+	 *
+	 * @listens $('a[href="#categories-all"]'):click
+	 *
+	 * @return {void}
+	 */
 	$('a[href="#categories-all"]').click(function(){deleteUserSetting('cats');});
+
+	/**
+	 * Set the user setting regarding which category tab should be shown to display
+	 * popular categories.
+	 *
+	 * @listens $('a[href="#categories-pop"]'):click
+	 *
+	 * @return {void}
+	 */
 	$('a[href="#categories-pop"]').click(function(){setUserSetting('cats','pop');});
+
 	if ( 'pop' == getUserSetting('cats') )
 		$('a[href="#categories-pop"]').click();
 
+	/**
+	 * Adds event that shows the interface controls to add a new category.
+	 *
+	 * @listens $('#category-add-toggle'):click
+	 *
+	 * @param {Event} event The event object.
+	 * @returns {Boolean} False, prevents regular link functionality.
+	 */
 	$('#category-add-toggle').click( function() {
 		$(this).parents('div:first').toggleClass( 'wp-hidden-children' );
 		$('#category-tabs a[href="#categories-all"]').click();