diff --git a/src/wp-admin/js/postbox.js b/src/wp-admin/js/postbox.js
index a8222ee..d36dde6 100644
--- a/src/wp-admin/js/postbox.js
+++ b/src/wp-admin/js/postbox.js
@@ -1,11 +1,45 @@
+/**
+ * Contains the postboxes logic, opening and closing postboxes, reordering and saving
+ * the state and ordering to the database.
+ *
+ * @summary Contains postboxes logic
+ *
+ * @since 2.4.0
+ * @requires jQuery
+ */
+
 /* global ajaxurl, postBoxL10n */
 
+/**
+ * This object contains all function to handle the behaviour of the post boxes. The post boxes are the boxes you see
+ * around the content on the edit page.
+ *
+ * @since 2.7.0
+ *
+ * @namespace postboxes
+ *
+ * @type {Object}
+ */
 var postboxes;
 
 (function($) {
 	var $document = $( document );
 
 	postboxes = {
+
+		/**
+		 * @summary Handles a click on either the postbox heading or the postbox open/close icon.
+		 *
+		 * Opens or closes the postbox. Expects `this` to equal the clicked element.
+		 * Calls postboxes.pbshow if the postbox has been opened, calls postboxes.pbhide
+		 * if the postbox has been closed.
+		 *
+		 * @since 4.4.0
+		 * @memberof postboxes
+		 * @fires postboxes#postbox-toggled
+		 *
+		 * @returns {void}
+		 */
 		handle_click : function () {
 			var $el = $( this ),
 				p = $el.parent( '.postbox' ),
@@ -41,9 +75,30 @@ var postboxes;
 				}
 			}
 
+			/**
+			 * @summary Fires when a postbox has been opened or closed.
+			 *
+			 * Contains a jQuery object with the relevant postbox element.
+			 *
+			 * @since 4.0.0
+			 * @event postboxes#postbox-toggled
+			 * @type {Object}
+			 */
 			$document.trigger( 'postbox-toggled', p );
 		},
 
+		/**
+		 * Adds event handlers to all postboxes and screen option on the current page.
+		 *
+		 * @since 2.7.0
+		 * @memberof postboxes
+		 *
+		 * @param {string} page The page we are currently on.
+		 * @param {Object} [args]
+		 * @param {Function} args.pbshow A callback that is called when a postbox opens.
+		 * @param {Function} args.pbhide A callback that is called when a postbox closes.
+		 * @returns {void}
+		 */
 		add_postbox_toggles : function (page, args) {
 			var $handles = $( '.postbox .hndle, .postbox .handlediv' );
 
@@ -52,16 +107,40 @@ var postboxes;
 
 			$handles.on( 'click.postboxes', this.handle_click );
 
+			/**
+			 * @since 2.7.0
+			 */
 			$('.postbox .hndle a').click( function(e) {
 				e.stopPropagation();
 			});
 
+			/**
+			 * @summary Hides a postbox.
+			 *
+			 * Event handler for the postbox dismiss button. After clicking the button
+			 * the postbox will be hidden.
+			 *
+			 * @since 3.2.0
+			 *
+			 * @returns {void}
+			 */
 			$( '.postbox a.dismiss' ).on( 'click.postboxes', function( e ) {
 				var hide_id = $(this).parents('.postbox').attr('id') + '-hide';
 				e.preventDefault();
 				$( '#' + hide_id ).prop('checked', false).triggerHandler('click');
 			});
 
+			/**
+			 * @summary Hides the postbox element
+			 *
+			 * Event handler for the screen options checkboxes. When a checkbox is
+			 * clicked this function will hide or show the relevant postboxes.
+			 *
+			 * @since 2.7.0
+			 * @fires postboxes#postbox-toggled
+			 *
+			 * @returns {void}
+			 */
 			$('.hide-postbox-tog').bind('click.postboxes', function() {
 				var $el = $(this),
 					boxId = $el.val(),
@@ -78,11 +157,24 @@ var postboxes;
 						postboxes.pbhide( boxId );
 					}
 				}
+
 				postboxes.save_state( page );
 				postboxes._mark_area();
+
+				/**
+				 * @since 4.0.0
+				 * @see postboxes.handle_click
+				 */
 				$document.trigger( 'postbox-toggled', $postbox );
 			});
 
+			/**
+			 * @summary Changes the amount of columns based on the layout preferences.
+			 *
+			 * @since 2.8.0
+			 *
+			 * @returns {void}
+			 */
 			$('.columns-prefs input[type="radio"]').bind('click.postboxes', function(){
 				var n = parseInt($(this).val(), 10);
 
@@ -93,6 +185,20 @@ var postboxes;
 			});
 		},
 
+		/**
+		 * @summary Initializes all the postboxes, mainly their sortable behaviour.
+		 *
+		 * @since 2.7.0
+		 * @memberof postboxes
+		 *
+		 * @param {string} page The page we are currently on.
+		 * @param {Object} [args={}] The arguments for the postbox initializer.
+		 * @param {Function} args.pbshow A callback that is called when a postbox opens.
+		 * @param {Function} args.pbhide A callback that is called when a postbox
+		 *                               closes.
+		 *
+		 * @returns {void}
+		 */
 		init : function(page, args) {
 			var isMobile = $( document.body ).hasClass( 'mobile' ),
 				$handleButtons = $( '.postbox .handlediv' );
@@ -110,12 +216,13 @@ var postboxes;
 				tolerance: 'pointer',
 				forcePlaceholderSize: true,
 				helper: function( event, element ) {
-					// `helper: 'clone'` is equivalent to `return element.clone();`
-					// Cloning a checked radio and then inserting that clone next to the original
-					// radio unchecks the original radio (since only one of the two can be checked).
-					// We get around this by renaming the helper's inputs' name attributes so that,
-					// when the helper is inserted into the DOM for the sortable, no radios are
-					// duplicated, and no original radio gets unchecked.
+					/* `helper: 'clone'` is equivalent to `return element.clone();`
+					 * Cloning a checked radio and then inserting that clone next to the original
+					 * radio unchecks the original radio (since only one of the two can be checked).
+					 * We get around this by renaming the helper's inputs' name attributes so that,
+					 * when the helper is inserted into the DOM for the sortable, no radios are
+					 * duplicated, and no original radio gets unchecked.
+					 */
 					return element.clone()
 						.find( ':input' )
 							.attr( 'name', function( i, currentName ) {
@@ -157,6 +264,18 @@ var postboxes;
 			});
 		},
 
+		/**
+		 * @summary Saves the state of the postboxes to the server.
+		 *
+		 * Saves the state of the postboxes to the server. It sends two lists, one with
+		 * all the closed postboxes, one with all the hidden postboxes.
+		 *
+		 * @since 2.7.0
+		 * @memberof postboxes
+		 *
+		 * @param {string} page The page we are currently on.
+		 * @returns {void}
+		 */
 		save_state : function(page) {
 			var closed, hidden;
 
@@ -177,6 +296,18 @@ var postboxes;
 			});
 		},
 
+		/**
+		 * @summary Saves the order of the postboxes to the server.
+		 *
+		 * Saves the order of the postboxes to the server. Sends a list of all postboxes
+		 * inside a sortable area to the server.
+		 *
+		 * @since 2.8.0
+		 * @memberof postboxes
+		 *
+		 * @param {string} page The page we are currently on.
+		 * @returns {void}
+		 */
 		save_order : function(page) {
 			var postVars, page_columns = $('.columns-prefs input:checked').val() || 0;
 
@@ -186,12 +317,27 @@ var postboxes;
 				page_columns: page_columns,
 				page: page
 			};
+
 			$('.meta-box-sortables').each( function() {
 				postVars[ 'order[' + this.id.split( '-' )[0] + ']' ] = $( this ).sortable( 'toArray' ).join( ',' );
 			} );
+
 			$.post( ajaxurl, postVars );
 		},
 
+		/**
+		 * @summary Marks empty postbox areas.
+		 *
+		 * Adds a message to empty sortable areas on the dashboard page. Also adds a
+		 * border around the side area on the post edit screen if there are no postboxes
+		 * present.
+		 *
+		 * @since 3.3.0
+		 * @memberof postboxes
+		 * @access private
+		 *
+		 * @returns {void}
+		 */
 		_mark_area : function() {
 			var visible = $('div.postbox:visible').length, side = $('#post-body #side-sortables');
 
@@ -215,6 +361,17 @@ var postboxes;
 			}
 		},
 
+		/**
+		 * @summary Changes the amount of columns on the post edit page.
+		 *
+		 * @since 3.3.0
+		 * @memberof postboxes
+		 * @fires postboxes#postboxes-columnchange
+		 * @access private
+		 *
+		 * @param {number} n The amount of columns to divide the post edit page in.
+		 * @returns {void}
+		 */
 		_pb_edit : function(n) {
 			var el = $('.metabox-holder').get(0);
 
@@ -222,9 +379,25 @@ var postboxes;
 				el.className = el.className.replace(/columns-\d+/, 'columns-' + n);
 			}
 
+			/**
+			 * Fires when the amount of columns on the post edit page has been changed.
+			 *
+			 * @since 4.0.0
+			 * @event postboxes#postboxes-columnchange
+			 */
 			$( document ).trigger( 'postboxes-columnchange' );
 		},
 
+		/**
+		 * @summary Changes the amount of columns the postboxes are in based on the
+		 *          current orientation of the browser.
+		 *
+		 * @since 3.3.0
+		 * @memberof postboxes
+		 * @access private
+		 *
+		 * @returns {void}
+		 */
 		_pb_change : function() {
 			var check = $( 'label.columns-prefs-1 input[type="radio"]' );
 
@@ -247,8 +420,23 @@ var postboxes;
 		},
 
 		/* Callbacks */
+
+		/**
+		 * @since 2.7.0
+		 * @memberof postboxes
+		 * @access public
+		 * @property {Function|boolean} pbshow A callback that is called when a postbox
+		 *                                     is opened.
+		 */
 		pbshow : false,
 
+		/**
+		 * @since 2.7.0
+		 * @memberof postboxes
+		 * @access public
+		 * @property {Function|boolean} pbhide A callback that is called when a postbox
+		 *                                     is closed.
+		 */
 		pbhide : false
 	};