diff --git a/README.md b/README.md
index 350ba3e..0c4232f 100644
--- a/README.md
+++ b/README.md
@@ -76,15 +76,17 @@ It uses the pre-trained model specified by model name to generate an image embed
 
 **Parameters:**
 
-​	***img***: *numpy.ndarray*
+​	***img***: *[towhee.types.Image]()*
 
-​	The decoded image data in numpy.ndarray.
+​	The decoded image data in towhee.types.Image (numpy.ndarray).
 
 
 
-**Returns**: *numpy.ndarray*
+**Returns**:
 
-​	The image embedding extracted by model.
+​   *numpy.ndarray*
+
+​   The image embedding extracted by model.