Adding property definition for Model::$virtualFields

cake/libs/model/model.php

@@ -298,6 +298,20 @@ class Model extends Overloadable {
  */
 	var $order = null;
 
+/**
+ * Array of virtual fields this model has.  Virtual fields are aliased
+ * SQL expressions. Fields added to this property will be read as other fields in a model
+ * but will not be saveable.
+ *
+ * `var $virtualFields = array('two' => '1 + 1');` 
+ *
+ * Is a simplistic example of how to set virtualFields
+ *
+ * @var array
+ * @access public
+ */
+	var $virtualFields = array();
+
 /**
  * Whether or not the model record exists, set by Model::exists().
  *