diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index 5e1fce90fd..fcb2b42e64 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -605,8 +605,7 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
 
     /**
      * Method: getServerResolution
-     * Return the closest server-supported resolution. Throw an
-     * exception if none is found in the serverResolutions array.
+     * Return the closest server-supported resolution.
      *
      * Parameters:
      * resolution - {Number} The base resolution. If undefined the
@@ -1193,7 +1192,7 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
      * Parameters:
      * prepend - {Boolean} if true, prepend to beginning.
      *                          if false, then append to end
-     * tileSize - {<OpenLayers.Size>} rendered tile size
+     * tileSize - {Object} rendered tile size; object with w and h properties
      */
     shiftRow:function(prepend, tileSize) {
         var modelRowIndex = (prepend) ? 0 : (this.grid.length - 1);
@@ -1229,7 +1228,7 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
      * Parameters:
      * prepend - {Boolean} if true, prepend to beginning.
      *                          if false, then append to end
-     * tileSize - {<OpenLayers.Size>} rendered tile size
+     * tileSize - {Object} rendered tile size; object with w and h properties
      */
     shiftColumn: function(prepend, tileSize) {
         var sign = prepend ? -1 : 1;