diff --git a/lib/OpenLayers/Layer.js b/lib/OpenLayers/Layer.js
index dd6ebd790a..595c51f3f5 100644
--- a/lib/OpenLayers/Layer.js
+++ b/lib/OpenLayers/Layer.js
@@ -268,9 +268,11 @@ OpenLayers.Layer = OpenLayers.Class({
     
     /**
      * Property: resolution
-     * {Float} Current resolution that the layer is drawn in. Used by
-     * subclasses to determine whether the zoom has changed when calling
-     * <moveTo>.
+     * {Float} Current resolution that the layer is drawn in. This is
+     *     used to determine whether the zoom has changed when calling
+     *     <moveTo> from <redraw>. Subclasses may set this.resolution to
+     *     null prior to calling redraw to force passing zoomChanged
+     *     true to moveTo.
      */
     resolution: null,