diff --git a/machine.proto b/machine.proto
index 7ce8c34..0d1f0f2 100644
--- a/machine.proto
+++ b/machine.proto
@@ -8,7 +8,7 @@ import "google/protobuf/timestamp.proto"; // Import the well-known type for Time
 // global settings for autogenpb `autogenpb:mutex`
 
 message Machine {                                       // `autogenpb:marshal`
-        string                      hostname      = 1;  // `autogenpb:unique`
+        string                      hostname      = 1;  // `autogenpb:unique` `autogenpb:sort`
         int64                       memory        = 2;
         int64                       cpus          = 3;
         string                      distro        = 4;