diff --git a/lib/OpenLayers/Map.js b/lib/OpenLayers/Map.js
index cf5d1d0d97..ba7e7006fe 100644
--- a/lib/OpenLayers/Map.js
+++ b/lib/OpenLayers/Map.js
@@ -75,7 +75,9 @@ OpenLayers.Map = OpenLayers.Class({
      *     The *layer* property will be a reference to the changed layer. The
      *     *property* property will be a key to the changed property (name,
      *     order, opacity, params, visibility or attribution).
-     * movestart - triggered after the start of a drag, pan, or zoom
+     * movestart - triggered after the start of a drag, pan, or zoom. The event
+     *     object may include a *zoomChanged* property that tells whether the
+     *     zoom has changed.
      * move - triggered after each drag, pan, or zoom
      * moveend - triggered after a drag, pan, or zoom completes
      * zoomend - triggered after a zoom completes