diff --git a/README.md b/README.md
index 168ff1f..0adc80c 100644
--- a/README.md
+++ b/README.md
@@ -9,23 +9,22 @@ This operator uses reads the waveform of an audio file and then applies VGGish t
 ## Interface
 
 ```python
-__call__(self, audio_path: str)
+__call__(self, datas: List[NamedTuple('data', [('audio', 'ndarray'), ('sample_rate', 'int')])])
 ```
 
 **Args:**
 
-- audio_path:
-  - the input audio path
-  - supported types: str
+- datas:
+  - a named tuple including audio data in numpy.ndarray and sample rate in integer
 
 **Returns:**
 
 The Operator returns a tuple Tuple[('embs', numpy.ndarray)] containing following fields:
 
-- embs:
+- vec:
   - embeddings of the audio
   - data type: `numpy.ndarray`
-  - shape: (num_clips,128)
+  - shape: (num_clips, 128)
 
 ## Requirements