--- steps/step-3/index.html	2016-09-19 12:15:07.000000000 +0200
+++ steps/step-4/index.html	2016-09-19 12:15:06.000000000 +0200
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <title>Make the map use the full window</title>
+    <title>Add an alternative tile layer</title>
     <meta charset="utf-8" />
     <script src="../../bower_components/leaflet/dist/leaflet.js"></script>
     <link rel="stylesheet" href="../../bower_components/leaflet/dist/leaflet.css"/>
@@ -26,8 +26,15 @@
       var zoom = 18;
 
       var osmLayer = L.tileLayer.provider('OpenStreetMap.Mapnik');
+      var germanLayer = L.tileLayer.provider('OpenStreetMap.DE');
 
       var myMap = L.map('mapDiv', { layers: osmLayer}).setView(latLon, zoom);
+
+      var baseLayers = {
+                         'OSM': osmLayer, 
+                         'German': germanLayer
+                       };
+      L.control.layers(baseLayers).addTo(myMap);
     </script>
   </body>
 </html>