add missing example link

docs/index.html

@@ -18,6 +18,7 @@ <h1>LocAR.js examples</h1>
 <li><a href='01-helloworld/index.html'>Hello World</a>: Display a red cube just to the north of a fake GPS location. Can be tested on a desktop or laptop.</li>
 <li><a href='02-gps-and-sensors/index.html'>GPS and Sensors</a>: Requires a mobile device wih GPS and sensors. Demonstrates use of the GPS and the device sensors to show real AR. Gets your initial location and displays four coloured boxes to the north (red), south (yellow), west (blue) and east (green) of your initial location. Can be used as a test to check whether your device sensors are accurate; if the red box does not appear to the North, your device sensors may be mis-calibrated.</li>
 <li><a href='03-ar-objects/index.html'>AR Objects</a>: shows how you can add real AR objects with a given latitude and longitude and properties. Also shows how you can detect clicks on objects. Uses a hard-coded "fake" location and hard-coded objects, and you can rotate the three.js camera using the mouse, so will work on a desktop or laptop.</li>
+<li><a href='04-api-communication/index.html'>API Communication</a>: shows how you can communicate with a live GeoJSON API (OpenStreetMap-based). The GeoJSON is parsed, and AR objects created from each GeoJSON feature in the feed. Uses your current real GPS location and the device sensors, so <strong>requires a real mobile device.</strong>. It also uses each object's OpenStreetMap ID to cache objects in memory as they are added, preventing the same object being added twice. Note that a new request to the server is performed if you move 100 metres; a better solution to minimise the number of server requests would be to implement a tiling system. This will hopefully appear soon!</li>
 </ol>
 </body>
 </html>

examples/index.html

@@ -18,6 +18,7 @@ <h1>LocAR.js examples</h1>
 <li><a href='01-helloworld/index.html'>Hello World</a>: Display a red cube just to the north of a fake GPS location. Can be tested on a desktop or laptop.</li>
 <li><a href='02-gps-and-sensors/index.html'>GPS and Sensors</a>: Requires a mobile device wih GPS and sensors. Demonstrates use of the GPS and the device sensors to show real AR. Gets your initial location and displays four coloured boxes to the north (red), south (yellow), west (blue) and east (green) of your initial location. Can be used as a test to check whether your device sensors are accurate; if the red box does not appear to the North, your device sensors may be mis-calibrated.</li>
 <li><a href='03-ar-objects/index.html'>AR Objects</a>: shows how you can add real AR objects with a given latitude and longitude and properties. Also shows how you can detect clicks on objects. Uses a hard-coded "fake" location and hard-coded objects, and you can rotate the three.js camera using the mouse, so will work on a desktop or laptop.</li>
+<li><a href='04-api-communication/index.html'>API Communication</a>: shows how you can communicate with a live GeoJSON API (OpenStreetMap-based). The GeoJSON is parsed, and AR objects created from each GeoJSON feature in the feed. Uses your current real GPS location and the device sensors, so <strong>requires a real mobile device.</strong>. It also uses each object's OpenStreetMap ID to cache objects in memory as they are added, preventing the same object being added twice. Note that a new request to the server is performed if you move 100 metres; a better solution to minimise the number of server requests would be to implement a tiling system. This will hopefully appear soon!</li>
 </ol>
 </body>
 </html>