diff --git a/README.md b/README.md
index a832f4a..987c5c8 100644
--- a/README.md
+++ b/README.md
@@ -64,14 +64,14 @@ Create the operator via the following factory method
 
 ## Interface
 
-An image-text embedding operator takes a [towhee image](link/to/towhee/image/api/doc) as input and generate the correspoing caption.
+An image captioning operator takes a [towhee image](link/to/towhee/image/api/doc) as input and generate the correspoing caption.
 
 
 **Parameters:**
 
 ​	***img:*** *towhee.types.Image (a sub-class of numpy.ndarray)*
 
-​  The image to generate embedding.	
+​  The image to generate caption.	
 
 
 
diff --git a/requirements.txt b/requirements.txt
index ca9f2ee..f4f40e9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,6 @@ torch
 torchvision
 timm
 towhee
+ftfy
+yacs
+numpy