diff --git a/README.md b/README.md
index 52a7025..2896ef8 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,38 @@ question = 'Where was it played?'
 answer = p(question, [], history).get()[0]
 ```
 
+*Write a [retrieval-augmented generation pipeline](https://towhee.io/tasks/detail/pipeline/retrieval-augmented-generation) with explicit inputs/outputs name specifications:*
+
+```python
+from towhee import pipe, ops
+
+
+temp = '''{question}
+
+Input:
+{context}
+'''
+
+
+docs = ['You can install Towhee via the command `pip install towhee`.']
+history = [
+    ('What is Towhee?', 'Towhee is an open-source machine learning project that helps you encode your unstructured data into embeddings.')
+]
+question = 'How to install it?'
+
+p = (
+    pipe.input('question', 'docs', 'history')
+        .map(('question', 'docs', 'history'),
+             'prompt',
+             ops.prompt.template(temp, ['question', 'context']))
+        .map('prompt', 'answer',
+             ops.LLM.Dolly())
+        .output('answer')
+)
+
+answer = p(question, docs, history).get()[0]
+```
+
 <br />
 
 ## Factory Constructor
diff --git a/hf_dolly.py b/hf_dolly.py
index 70b04a7..1351bd5 100644
--- a/hf_dolly.py
+++ b/hf_dolly.py
@@ -21,7 +21,7 @@ from towhee.operator.base import PyOperator, SharedType
 
 
 class HuggingfaceDolly(PyOperator):
-    '''Wrapper of OpenAI Chat API'''
+    '''Wrapper of Dolly inference'''
     def __init__(self,
                  model_name: str = 'databricks/dolly-v2-12b',
                  **kwargs
diff --git a/requirements.txt b/requirements.txt
index f3592a7..a2d545a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 transformers[torch]>=4.28.1,<5
 torch>=1.13.1,<2
+accelerate