diff --git a/core/java/android/app/backup/IBackupObserver.aidl b/core/java/android/app/backup/IBackupObserver.aidl
index 07a6634b5a1e5..fabe35396a4d3 100644
--- a/core/java/android/app/backup/IBackupObserver.aidl
+++ b/core/java/android/app/backup/IBackupObserver.aidl
@@ -51,7 +51,7 @@ oneway interface IBackupObserver {
      * even if no individual package backup operations were attempted.
      *
      * @param status Zero on success; a nonzero error code if the backup operation
-     *   as a whole failed.
+     *   as a whole failed with a transport error.
      */
     void backupFinished(int status);
 }