Update README.md

README.md

@@ -6,6 +6,8 @@ This allows you to add a Google Map region to any page.
 
 The user can click the map to set a single Marker. You can have the region synchronize the map with an item you nominate - if so, the position where the user clicks will be written to the item as a lat,long pair of coordinates. If the item is loaded with some coordinators, or changed by the user, the map marker will be moved to the indicated position.
 
+If you set a Google API Key, you gain access to additional features, including a Search by Address (find a point by an entered address), and Reverse Geocode Search (find an address for a selected point).
+
 ## DEMO ##
 
 [https://apex.oracle.com/pls/apex/f?p=JK64_SIMPLE_MAP](https://apex.oracle.com/pls/apex/f?p=JK64_SIMPLE_MAP)