diff --git a/lib/OpenLayers/Layer/TMS.js b/lib/OpenLayers/Layer/TMS.js
index a28490f563..930a80ad12 100644
--- a/lib/OpenLayers/Layer/TMS.js
+++ b/lib/OpenLayers/Layer/TMS.js
@@ -66,8 +66,8 @@ OpenLayers.Layer.TMS = OpenLayers.Class(OpenLayers.Layer.Grid, {
      * {<OpenLayers.LonLat>} Optional origin for aligning the grid of tiles.
      *     If provided, requests for tiles at all resolutions will be aligned
      *     with this location (no tiles shall overlap this location).  If
-     *     not provided, the grid of tiles will be aligned with the map's
-     *     <maxExtent>.  Default is ``null``.
+     *     not provided, the grid of tiles will be aligned with the bottom-left
+     *     corner of the map's <maxExtent>.  Default is ``null``.
      *
      * Example:
      * (code)