diff --git a/js/ui/mxgraph/src/js/layout/hierarchical/stage/mxHierarchicalLayoutStage.js b/js/ui/mxgraph/src/js/layout/hierarchical/stage/mxHierarchicalLayoutStage.js
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+++ b/js/ui/mxgraph/src/js/layout/hierarchical/stage/mxHierarchicalLayoutStage.js
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+/**
+ * Copyright (c) 2006-2015, JGraph Ltd
+ * Copyright (c) 2006-2015, Gaudenz Alder
+ */
+/**
+ * Class: mxHierarchicalLayoutStage
+ * 
+ * The specific layout interface for hierarchical layouts. It adds a
+ * <code>run</code> method with a parameter for the hierarchical layout model
+ * that is shared between the layout stages.
+ * 
+ * Constructor: mxHierarchicalLayoutStage
+ *
+ * Constructs a new hierarchical layout stage.
+ */
+function mxHierarchicalLayoutStage() { };
+
+/**
+ * Function: execute
+ * 
+ * Takes the graph detail and configuration information within the facade
+ * and creates the resulting laid out graph within that facade for further
+ * use.
+ */
+mxHierarchicalLayoutStage.prototype.execute = function(parent) { };