Index: /CKEditor/branches/prototype/_source/core/config.js
===================================================================
--- /CKEditor/branches/prototype/_source/core/config.js	(revision 2504)
+++ /CKEditor/branches/prototype/_source/core/config.js	(revision 2505)
@@ -196,5 +196,21 @@
 	 */
 	basePopupZIndex : 10000,
+
+	/**
+	 * The color of the dialog background cover. It should be a valid CSS color string.
+	 * @type String
+	 * @default white
+	 * @example
+	 * config.backgroundCoverColor = 'rgb(255, 254, 253)';
+	 */
 	backgroundCoverColor : 'white',
+
+	/**
+	 * The opacity of the dialog background cover. It should be a number within the range [0.0, 1.0].
+	 * @type Number 
+	 * @default 0.5
+	 * @example
+	 * config.backgroundCoverOpacity = 0.7;
+	 */
 	backgroundCoverOpacity : 0.5
 };