diff --git a/doc/todo/osm_arbitrary_layers.mdwn b/doc/todo/osm_arbitrary_layers.mdwn
index b374f5495..a2e41dc61 100644
--- a/doc/todo/osm_arbitrary_layers.mdwn
+++ b/doc/todo/osm_arbitrary_layers.mdwn
@@ -22,3 +22,5 @@ I got tired of hacking at the osm.pm every time I wanted to change the layers, s
 
 >>> If there's no reason to order the other layers, that makes some sense.
 >>> --[[Joey]]
+
+>>>> The layers are ordered because that's the way they are displayed in the menu. Take a look at the base layers on the top left here for an idea: <http://wiki.reseaulibre.ca/ikiwiki.cgi?map=map&do=osm&zoom=12&lat=45.5227&lon=-73.59554>. -- [[anarcat]]