diff --git a/README.md b/README.md
index f9c68c2..bed122c 100644
--- a/README.md
+++ b/README.md
@@ -35,11 +35,32 @@ $ pip install https://github.com/ludlows/python-pesq/archive/master.zip
 $ pip3 install https://github.com/ludlows/python-pesq/archive/master.zip
 ```
 
-# Example for narrow band and wide band
+# Usage for narrow-band and wide-band Modes
 
-when using it, please note that the sampling rate (frequency) should be 16000 or 8000. 
+Please note that the sampling rate (frequency) should be 16000 or 8000 (Hz). 
 
-And using 8000 is supported for narrow band only.
+And using 8000Hz is supported for narrow band only.
+
+The code supports error-handling behaviors now.
+
+```python
+def pesq(fs, ref, deg, mode, on_error=PesqError.RAISE_EXCEPTION):
+    """
+    Args:
+        ref: numpy 1D array, reference audio signal 
+        deg: numpy 1D array, degraded audio signal
+        fs:  integer, sampling rate
+        mode: 'wb' (wide-band) or 'nb' (narrow-band)
+        on_error: error-handling behavior, it could be PesqError.RETURN_VALUES or PesqError.RAISE_EXCEPTION by default
+    Returns:
+        pesq_score: float, P.862.2 Prediction (MOS-LQO)
+    """
+```
+Once you select `PesqError.RETURN_VALUES`, the `pesq` function will return -1 when an error occurs.
+
+Once you select `PesqError.RAISE_EXCEPTION`, the `pesq` function will raise an exception when an error occurs.
+
+It supports the following errors now: `InvalidSampleRateError`, `OutOfMemoryError`,`BufferTooShortError`,`NoUtterancesError`,`PesqError`(other unknown errors).
 
 ```python
 from scipy.io import wavfile
@@ -71,29 +92,6 @@ The original C soure code is modified.
 # Who is using `python-pesq`
 Please click [here](https://github.com/ludlows/python-pesq/network/dependents) to see these repositories, whose owners include `Facebook Research`, `SpeechBrain`, `NVIDIA` .etc.
 
-# Expressing your opinions on the error-handling behaviors
-The code on `dev` branch supports error-handling behaviors now.
-
-```python
-def pesq(fs, ref, deg, mode, on_error=PesqError.RAISE_EXCEPTION):
-    """
-    Args:
-        ref: numpy 1D array, reference audio signal 
-        deg: numpy 1D array, degraded audio signal
-        fs:  integer, sampling rate
-        mode: 'wb' (wide-band) or 'nb' (narrow-band)
-        on_error: error-handling behavior, it could be PesqError.RETURN_VALUES or PesqError.RAISE_EXCEPTION by default
-    Returns:
-        pesq_score: float, P.862.2 Prediction (MOS-LQO)
-    """
-```
-Once you select `PesqError.RETURN_VALUES`, the `pesq` function will return -1 when an error occurs.
-
-Once you select `PesqError.RAISE_EXCEPTION`, the `pesq` function will raise an exception when an error occurs.
-
-It supports the following errors now: `InvalidSampleRateError`, `OutOfMemoryError`,`BufferTooShortError`,`NoUtterancesError`,`PesqError`(other unknown errors).
-
-Thanks to the contribution from [@Rafgd](https://github.com/Rafagd). 
 
 # Buy me a Coffee
 [Buy](https://www.paypal.me/wangmiao521) me a Coffee if my work helps you in some ways.