diff --git a/pkg/zones/machine.go b/pkg/zones/machine.go
index 1dd64a2..8500e9e 100644
--- a/pkg/zones/machine.go
+++ b/pkg/zones/machine.go
@@ -15,6 +15,8 @@ type Machine struct {
 
 	PublicAddresses []netip.Addr `toml:"public,omitempty" json:"public,omitempty" yaml:"public,omitempty"`
 	Rings           []*RingInfo  `toml:"rings,omitempty"  json:"rings,omitempty"  yaml:"rings,omitempty"`
+
+	CephMonitor bool `toml:"ceph_monitor,omitempty" json:"ceph_monitor,omitempty" yaml:"ceph_monitor,omitempty"`
 }
 
 // revive:enable:line-length-limit