diff --git a/public/js/icinga/behavior/collapsibleContainer.js b/public/js/icinga/behavior/collapsibleContainer.js
index 24fd1164b..8fd513551 100644
--- a/public/js/icinga/behavior/collapsibleContainer.js
+++ b/public/js/icinga/behavior/collapsibleContainer.js
@@ -1,4 +1,4 @@
-/*! Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+/*! Icinga Web 2 | (c) 2018 Icinga Development Team | GPLv2+ */
 
 ;(function(Icinga, $) {
 
@@ -9,6 +9,13 @@
     var defaultNumOfRows = 2;
     var defaultHeight = 36;
 
+    /**
+     * Behavior for collapsible containers. Creates collapsible containers from `<div class="collapsible-container">…</div>`
+     * or <div class="collapsible-container"><div class="collapsible">…</div></div>`
+     *
+     * @param  icinga  Icinga  The current Icinga Object
+     */
+
     function CollapsibleContainer(icinga) {
         Icinga.EventListener.call(this, icinga);
 
@@ -18,6 +25,11 @@
 
     CollapsibleContainer.prototype = new Icinga.EventListener();
 
+    /**
+     * Initializes all collapsible-container elements. Triggered on rendering of a container.
+     *
+     * @param event  Event  The `onRender` event triggered by the rendered container
+     */
     CollapsibleContainer.prototype.onRendered = function(event) {
         $(event.target).find('.collapsible-container').each(function() {
             var $this = $(this);
@@ -56,6 +68,11 @@
         });
     };
 
+    /**
+     * Event handler for clocking collapsible control. Toggles the collapsed state of the respective container.
+     *
+     * @param event  Event  The `onClick` event triggered by the clicked collapsible-control element
+     */
     CollapsibleContainer.prototype.onControlClicked = function(event) {
         var $target = $(event.target);
         var $c = $target.closest('.collapsible-container, .collapsible-table-container');
@@ -72,7 +89,13 @@
         updateCollapsedState($c);
     };
 
-    function updateCollapsedState($container, listener) {
+    /**
+     * Renders the collapse state of the given container. Adds or removes class `collapsible` to containers and sets the
+     * height.
+     *
+     * @param $container  jQuery  The given collapsible container element
+     */
+    function updateCollapsedState($container) {
         var $collapsible;
         if ($container.hasClass('has-collapsible')) {
             $collapsible = $container.find('.collapsible');