diff --git a/README.md b/README.md
index 1797522..944e139 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,11 @@
 ```Python
 import towhee
 
-towhee.glob('./music.mp3').audio_decode().flatten().show(limit=1)
+towhee.glob('./music.mp3').audio_decode.ffmpeg().flatten().show(limit=1)
+
+
+# batch decode
+# towhee.glob('./music.mp3').audio_decode.ffmpeg(500).flatten().show(limit=1)
 
 ```
 
@@ -39,6 +43,10 @@ Create the operator via the following factory method:
 
 ***audio_decode.ffmpeg()***
 
+batch decode, batch_size = 100:
+
+***audio_decode.ffmpeg(100)***
+
 
 
 <br />