diff --git a/index.d.ts b/index.d.ts
index 768199b6..d3531b51 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -36,6 +36,7 @@ interface InputByType {
 
 interface OutputByType {
     base64: string;
+    string: string;
     text: string;
     binarystring: string;
     array: number[];