diff --git a/environments/networks-disable.j2.yaml b/environments/networks-disable.j2.yaml
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+++ b/environments/networks-disable.j2.yaml
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+# Disable the creation of Neutron networks
+# This can be useful if you want to create two stacks along side of each
+# other. The first stack (doesn't use this environment) and creates
+# all of the Neutron networks. The second stack suppresses the
+# creation of Networks and shares the same network spaces.
+resource_registry:
+
+  {%- for network in networks %}
+  OS::TripleO::Network::{{network.name}}: OS::Heat::None
+  {%- endfor %}
+
+  #FIXME: probably also want to suppress creation of overcloud.yaml VIPs as well