diff --git a/pkg/models/zone.go b/pkg/models/zone.go
index 8244da2..58cd4b4 100644
--- a/pkg/models/zone.go
+++ b/pkg/models/zone.go
@@ -86,7 +86,11 @@ func (zr *ZoneRequest) AddMemberByDeviceID(deviceID string) {
 	zr.Members = append(zr.Members, member)
 }
 
-// RemoveMember removes a device from the zone configuration
+// RemoveMember removes a device from the zone configuration.
+//
+// Deprecated: unused. Zone members are removed with the /removeZoneSlave
+// endpoint (client.RemoveZoneSlave), not by rebuilding the zone via /setZone, so
+// this helper has no callers. To be removed. See #511.
 func (zr *ZoneRequest) RemoveMember(deviceID string) {
 	for i, member := range zr.Members {
 		if member.DeviceID == deviceID {
@@ -96,12 +100,18 @@ func (zr *ZoneRequest) RemoveMember(deviceID string) {
 	}
 }
 
-// ClearMembers removes all members from the zone (creates standalone configuration)
+// ClearMembers removes all members from the zone (creates standalone configuration).
+//
+// Deprecated: unused. To make a device standalone, dissolve the zone instead
+// (client.DissolveZone, i.e. NewZoneRequest(master) with no members). To be
+// removed. See #511.
 func (zr *ZoneRequest) ClearMembers() {
 	zr.Members = []MemberEntry{}
 }
 
-// HasMember checks if a device is in the zone configuration
+// HasMember checks if a device is in the zone configuration.
+//
+// Deprecated: unused. To be removed. See #511.
 func (zr *ZoneRequest) HasMember(deviceID string) bool {
 	for _, member := range zr.Members {
 		if member.DeviceID == deviceID {