fix flow drawing in geo layout
diff --git a/web/ons-demo/js/map.js b/web/ons-demo/js/map.js
index d40c9cb..35ca77d 100644
--- a/web/ons-demo/js/map.js
+++ b/web/ons-demo/js/map.js
@@ -111,6 +111,8 @@
 		switchLayer = topology.append('g');
 		labelsLayer = topology.append('g');
 		linksLayer = topology.append('g');
+		flowLayer = topology.append('g');
+
 
 		cb();
 	});