diff --git a/binder_bindings/android/os/IUpdateEngine.aidl b/binder_bindings/android/os/IUpdateEngine.aidl
index 4c60eed..67f828a 100644
--- a/binder_bindings/android/os/IUpdateEngine.aidl
+++ b/binder_bindings/android/os/IUpdateEngine.aidl
@@ -18,14 +18,21 @@
 
 import android.os.IUpdateEngineCallback;
 
+/** @hide */
 interface IUpdateEngine {
+  /** @hide */
   void applyPayload(String url,
                     in long payload_offset,
                     in long payload_size,
                     in String[] headerKeyValuePairs);
+  /** @hide */
   boolean bind(IUpdateEngineCallback callback);
+  /** @hide */
   void suspend();
+  /** @hide */
   void resume();
+  /** @hide */
   void cancel();
+  /** @hide */
   void resetStatus();
 }
diff --git a/binder_bindings/android/os/IUpdateEngineCallback.aidl b/binder_bindings/android/os/IUpdateEngineCallback.aidl
index 729abdd..ee15c8b 100644
--- a/binder_bindings/android/os/IUpdateEngineCallback.aidl
+++ b/binder_bindings/android/os/IUpdateEngineCallback.aidl
@@ -16,7 +16,10 @@
 
 package android.os;
 
+/** @hide */
 oneway interface IUpdateEngineCallback {
+  /** @hide */
   void onStatusUpdate(int status_code, float percentage);
+  /** @hide */
   void onPayloadApplicationComplete(int error_code);
 }