Add additional help for private topologies

Today I discovered that with the alpha channel you can't use kubenet when using a private topology.
inodb · Feb 1, 2017 · d3e8156 · d3e8156
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commit d3e8156
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diff --git a/docs/topology.md b/docs/topology.md
@@ -34,3 +34,12 @@ To specify a topology use the `--topology` or `-t` flag as in :
 kops create cluster ... --topology public|private
 ```
 
+In the case of a private cluster you must also set a networking option other
+than `kubenet`.  Currently the supported options are:
+
+- kopeio-vxlan
+- weave
+- calico
+- cni
+
+More information about [networking options](networking.md) can be found in our documentation.