diff --git a/lib/OpenLayers/BaseTypes/LonLat.js b/lib/OpenLayers/BaseTypes/LonLat.js
index 4c78af43cf..0d825b7f65 100644
--- a/lib/OpenLayers/BaseTypes/LonLat.js
+++ b/lib/OpenLayers/BaseTypes/LonLat.js
@@ -114,7 +114,8 @@ OpenLayers.LonLat = OpenLayers.Class({
 
     /**
      * APIMethod: transform
-     * Transform the LonLat object from source to dest. 
+     * Transform the LonLat object from source to dest. This transformation is
+     *    *in place*: if you want a *new* lonlat, use .clone() first.
      *
      * Parameters: 
      * source - {<OpenLayers.Projection>} Source projection.