diff --git a/index.d.ts b/index.d.ts
index d3531b51..e11786d4 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -143,6 +143,7 @@ declare namespace JSZip {
         checkCRC32?: boolean;
         optimizedBinaryString?: boolean;
         createFolders?: boolean;
+        decodeFileName?: (bytes: string[] | Uint8Array | Buffer) => string;
     }
 }