diff --git a/security/keymint/aidl/default/Android.bp b/security/keymint/aidl/default/Android.bp
index 0cf53cf..fbb6140 100644
--- a/security/keymint/aidl/default/Android.bp
+++ b/security/keymint/aidl/default/Android.bp
@@ -7,6 +7,13 @@
     default_applicable_licenses: ["hardware_interfaces_license"],
 }
 
+// The following target has an insecure implementation of KeyMint where the
+// trusted application (TA) code runs in-process alongside the HAL service
+// code.
+//
+// A real device is required to run the TA code in a secure environment, as
+// per CDD 9.11 [C-1-1]: "MUST back up the keystore implementation with an
+// isolated execution environment."
 cc_binary {
     name: "android.hardware.security.keymint-service",
     relative_install_path: "hw",
@@ -46,6 +53,13 @@
     ],
 }
 
+// The following target has an insecure implementation of KeyMint where the
+// trusted application (TA) code runs in-process alongside the HAL service
+// code.
+//
+// A real device is required to run the TA code in a secure environment, as
+// per CDD 9.11 [C-1-1]: "MUST back up the keystore implementation with an
+// isolated execution environment."
 rust_binary {
     name: "android.hardware.security.keymint-service.nonsecure",
     relative_install_path: "hw",
diff --git a/security/keymint/aidl/default/main.rs b/security/keymint/aidl/default/main.rs
index 055c698..47143f4 100644
--- a/security/keymint/aidl/default/main.rs
+++ b/security/keymint/aidl/default/main.rs
@@ -17,11 +17,15 @@
 //! Default implementation of the KeyMint HAL and related HALs.
 //!
 //! This implementation of the HAL is only intended to allow testing and policy compliance.  A real
-//! implementation **must be implemented in a secure environment**.
+//! implementation **must implement the TA in a secure environment**, as per CDD 9.11 [C-1-1]:
+//! "MUST back up the keystore implementation with an isolated execution environment."
+//!
+//! The additional device-specific components that are required for a real implementation of KeyMint
+//! that is based on the Rust reference implementation are described in system/keymint/README.md.
 
 use kmr_hal::SerializedChannel;
 use kmr_hal_nonsecure::{attestation_id_info, get_boot_info};
-use log::{debug, error, info};
+use log::{debug, error, info, warn};
 use std::ops::DerefMut;
 use std::sync::{mpsc, Arc, Mutex};
 
@@ -62,7 +66,7 @@
         error!("{}", panic_info);
     }));
 
-    info!("Insecure KeyMint HAL service is starting.");
+    warn!("Insecure KeyMint HAL service is starting.");
 
     info!("Starting thread pool now.");
     binder::ProcessState::start_thread_pool();