diff --git a/lib/OpenLayers/Util.js b/lib/OpenLayers/Util.js
index 54e54a6853..0c98a87f1c 100644
--- a/lib/OpenLayers/Util.js
+++ b/lib/OpenLayers/Util.js
@@ -754,8 +754,8 @@ OpenLayers.Util.rad = function(x) {return x*Math.PI/180;};
  * Function: distVincenty
  * 
  * Parameters:
- * p1 - {Float}
- * p2 - {Float}
+ * p1 - {<OpenLayers.LonLat>} (or any object with both .lat, .lon properties)
+ * p2 - {<OpenLayers.LonLat>} (or any object with both .lat, .lon properties)
  * 
  * Returns:
  * {Float}