diff --git a/metropolis/proto/api/configuration.proto b/metropolis/proto/api/configuration.proto
index 8c953ed..41e57d0 100644
--- a/metropolis/proto/api/configuration.proto
+++ b/metropolis/proto/api/configuration.proto
@@ -26,6 +26,7 @@
 // fw_cfg).
 message NodeParameters {
     message ClusterBootstrap {
+        bytes owner_public_key = 1;
     }
     message ClusterRegister {
     }