--- step-9/index.html	2016-09-17 21:44:04.000000000 +0200
+++ step-10/index.html	2016-09-17 21:44:04.000000000 +0200
@@ -1,6 +1,6 @@
 <html>
   <head>
-    <title>Step 9: Google map material</title>
+    <title>Step 10: add a marker</title>
     <script src="../OpenLayers.js"></script>
     <script src="../OpenStreetMap.js"></script>
     <script src="http://maps.google.com/maps/api/js?sensor=false"></script>
@@ -70,6 +70,10 @@
             { 'type': google.maps.MapTypeId.SATELLITE, 'sphericalMercator': true } ));
         map.setCenter(new OpenLayers.LonLat(lon, lat).transform(projLonLat,projMercator), zoom);
         overviewMap.maximizeControl();
+
+        markers = new OpenLayers.Layer.Markers("Markers");
+        map.addLayer(markers);
+        markers.addMarker(new OpenLayers.Marker(new OpenLayers.LonLat(lon,lat).transform(projLonLat, projMercator)));
       }
     </script>
   </head>