diff --git a/README.md b/README.md
index 5f5f8a3..955ef44 100644
--- a/README.md
+++ b/README.md
@@ -5,64 +5,52 @@
 **Audio** **Decode** converts the encoded audio back to uncompressed audio frames. In most cases, audio decoding is the first step of an audio processing pipeline.
 
 
+Using the default audio_decode implementation and writing the pipeline in the simplified way
 
-### Interface
-
----
-
-def audio_decode.${op_name}(**kwargs):
-
-def ${op_name}.__call__(audio)
-
-"""
-
-An audio decode operator takes an audio file path as input. It decodes the audio back to audio frames.
-
-**Args:**
 
-**audio** (str):
+### Code Example
 
-Audio file path.
+---
 
-**Return** (iterable):
+```Python
+import towhee
 
-An iterator over audio frames with type `towhee.types.AudioFrame`.
+towhee.glob('./music.mp3')
+  .audio_decode().flaten()
 
-"""
+```
 
-### Code Example
 
+### Factory Constructor
 
+---
 
-Using the default audio_decode implementation and writing the pipeline in the simplified way
+Create the operator via the following factory method
 
-```Python
-import towhee.DataCollection as dc
+audio_decode.ffmpeg()
 
 
+### Interface
 
-dc.glob(./music.flac)
+---
 
-  .audio_decode()
+"""
 
-  .show()
-```
+An audio decode operator takes an audio file path as input. It decodes the audio back to audio frames.
 
+**Args:**
 
+**audio** (str):
 
-Using the ffmpeg based implementations of audio_decode to write a same pipeline
+Audio file path.
 
-```Python
-import towhee.DataCollection as dc
+**Return** (generator):
 
+An generator over audio frames with type `towhee.types.AudioFrame`.
 
+"""
 
-dc.glob['path'](./music.flac)
 
-  .audio_decode.ffmpeg['path', 'frames']()
 
-  .select('frames')
 
-  .show()
-```