diff --git a/.ipynb_checkpoints/未命名-checkpoint.ipynb b/.ipynb_checkpoints/未命名-checkpoint.ipynb
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--- a/.ipynb_checkpoints/未命名-checkpoint.ipynb
+++ /dev/null
@@ -1,6 +0,0 @@
-{
- "cells": [],
- "metadata": {},
- "nbformat": 4,
- "nbformat_minor": 5
-}
diff --git a/.ipynb_checkpoints/未命名1-checkpoint.ipynb b/.ipynb_checkpoints/未命名1-checkpoint.ipynb
deleted file mode 100644
index 363fcab..0000000
--- a/.ipynb_checkpoints/未命名1-checkpoint.ipynb
+++ /dev/null
@@ -1,6 +0,0 @@
-{
- "cells": [],
- "metadata": {},
- "nbformat": 4,
- "nbformat_minor": 5
-}
diff --git a/.ipynb_checkpoints/未命名2-checkpoint.ipynb b/.ipynb_checkpoints/未命名2-checkpoint.ipynb
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--- a/.ipynb_checkpoints/未命名2-checkpoint.ipynb
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@@ -1,6 +0,0 @@
-{
- "cells": [],
- "metadata": {},
- "nbformat": 4,
- "nbformat_minor": 5
-}
diff --git a/README.md b/README.md
index 3adedf6..8f64ea0 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ A face detection operator takes an image as input. It generates the bounding box
 
 **Parameters:**
 
-​	***img***: *numpy.ndarray.*
+​	***img***: *towhee.types.Image (a sub-class of numpy.ndarray)* 
 
 ​	the image to detect faces.
 
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