Update README.md

Author: Pygmalion69

README.md

@@ -11,6 +11,8 @@ OpenTopoMap viewer for Android
 
 Check out this post to learn more about preloading the cache for offline use: [Preloading Offline Maps in OpenTopoMap Viewer](https://pygmalion.nitri.org/preloading-offline-maps-in-opentopomap-viewer-1714.html).
 
+Basic routing with the [ORS Android Client](https://github.com/Pygmalion69/ors-android-client) is an experimental feature: [How to Enable Basic Routing with OpenRouteService (ORS) in OpenTopoMap Viewer](https://pygmalion.nitri.org/how-to-enable-basic-routing-with-openrouteservice-ors-in-opentopomap-viewer-1818.html).
+
 ![Wageningen](screen_wag.png "Wageningen") ![WUR](screen_wur.png "WUR")
 
 ![GPX](screen_dopplersteig.png "GPX") ![POI](screen_dopplersteig_poi.png "POI")