diff --git a/machine.proto b/machine.proto
index 0d1f0f2..ebb9c9f 100644
--- a/machine.proto
+++ b/machine.proto
@@ -17,6 +17,7 @@ message Machine {                                       // `autogenpb:marshal`
         Packages                    installed     = 7;  // packages that are installed
         Packages                    available     = 8;  // packages that are available
         Packages                    wit           = 9;  // packages that are available from mirrors.wit.com
+        string                      userAgent     = 10;
 }
 
 message Machines {                                      // `autogenpb:marshal`