diff --git a/src/types.ts b/src/types.ts
index c08eebb..74a3c5b 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -497,6 +497,7 @@ export interface FileAudioStream {
   channelLayout: Formats.Layout | null;
   version: Formats.Version | null;
   typeVersion: Formats.TypeVersion | null;
+  startTime: number | null;
 }
 
 export interface FileSubtitleStream {