diff --git a/firstboot/os-net-config-mappings.yaml b/firstboot/os-net-config-mappings.yaml
index 3cb4f2a8ec..dc105034c0 100644
--- a/firstboot/os-net-config-mappings.yaml
+++ b/firstboot/os-net-config-mappings.yaml
@@ -3,6 +3,8 @@ heat_template_version: rocky
 description: >
   Configure os-net-config mappings for specific nodes
   Your environment file needs to look like:
+    resource_registry:
+      OS::TripleO::NodeUserData: /usr/share/openstack-tripleo-heat-templates/firstboot/os-net-config-mappings.yaml
     parameter_defaults:
       NetConfigDataLookup:
         node1: