Index: 2_topo.html
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--- 2_topo.html	(revision 893)
+++ 2_topo.html	(revision 894)
@@ -56,9 +56,11 @@
 a detour to go around N2 clock-wise". To be able to determine which is the
 "first" crossing on N1, each two-net has one of its endpoint marked as the
 starting point.
+<p>
+Note: if there are more than 2 layers, each new layer adds 6 more possible
+states using vias.
 
 
-
 <h3> 2.3. Choosing between detour options </h3>
 <p>
 It is possible to draw a tree of the possible solutions. Each node of