Index: /CKEditor/trunk/_source/core/lang.js
===================================================================
--- /CKEditor/trunk/_source/core/lang.js	(revision 6025)
+++ /CKEditor/trunk/_source/core/lang.js	(revision 6026)
@@ -124,4 +124,6 @@
 		 * @param {String} defaultLanguage The default language to be returned
 		 *		if the user language is not supported.
+		 * @param {String} [probeLanguage] A language code to try to use,
+		 *		instead of the browser based autodetection.
 		 * @returns {String} The detected language code.
 		 * @example