diff --git a/README.md b/README.md
index e2d537bd40..c5e8865068 100644
--- a/README.md
+++ b/README.md
@@ -53,9 +53,10 @@ Check out the [custom example](http://leaflet.github.com/Leaflet.markercluster/e
 
 ### All Options
 Enabled by default (boolean options):
-* **zoomToBoundsOnClick**: When you click a cluster we zoom to its bounds.
 * **showCoverageOnHover**: When you mouse over a cluster it shows the bounds of its markers.
+* **zoomToBoundsOnClick**: When you click a cluster we zoom to its bounds.
 * **spiderfyOnMaxZoom**: When you click a cluster at the bottom zoom level we spiderfy it so you can see all of its markers.
+* **removeOutsideVisibleBounds**: Clusters and markers too far from the viewport are removed from the map for performance.
 
 Other options
 * **animateAddingMarkers**: If set to true then adding individual markers to the MarkerClusterGroup after it has been added to the map will add the marker and animate it in to the cluster. Defaults to false as this gives better performance when bulk adding markers. addLayers does not support this, only addLayer with individual Markers.