diff --git a/README.md b/README.md
index 9c8af44..d88c729 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 </h1></p>
 
 <p align="center">
-  Encode image from uri or image file to base64 on Node.js
+  Encode Media from uri or file to base64 on Node.js
 </p>
 
 ## Installation
@@ -15,17 +15,13 @@
 
 ## Usage
 
-### toBase64(image: Image): Promise<ResponsePayload>
+### toBase64(image: Media): Promise<string>
 
 ```ts
 interface Media {
   path?: string,
   uri?: string,
 }
-
-interface ResponsePayload {
-  base64?: string
-}
 ```
 
 ```js