diff --git a/src/lib.rs b/src/lib.rs
index e54cb14..fe3ed2c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -121,6 +121,8 @@ pub struct MeasurementLog {
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct VmInstanceConf {
     pub uuid: Uuid,
+    pub project: Uuid,
+    pub silo: Uuid,
     #[serde(rename = "boot-digest")]
     pub boot_digest: Option<Measurement>,
 }
diff --git a/test-data/vm-instance-cfg.json b/test-data/vm-instance-cfg.json
index 0ac2fb9..ee9b16a 100644
--- a/test-data/vm-instance-cfg.json
+++ b/test-data/vm-instance-cfg.json
@@ -2,6 +2,8 @@
     "//comment": "This structure / log is produced by the AttestMock that mocks",
     "//comment": "the behavior expected of the propolis process.",
     "uuid": "db5bf54c-48c5-4455-a1e1-6c7dfc26e351",
+    "project": "586bb54d-ee4b-465d-9701-b7b5d98f0945",
+    "silo": "23d10b56-9f45-4a7e-8f92-4af6cbbf2ed3",
     "image-digest": {
         "sha-256": "be4df4e085175f3de0c8ac4837e1c2c9a34e8983209dac6b549e94154f7cdd9c"
     }