diff --git a/README.md b/README.md
index da107e8..dca933a 100644
--- a/README.md
+++ b/README.md
@@ -79,9 +79,9 @@ An image decode operator takes an image path as input. It decodes the image back
 
 
 
-**Returns**: *numpy.ndarray*
+**Returns**: *towhee.types.Image*
 
-​	The decoded image data.
+​	The decoded image data as numpy.ndarray.