diff --git a/README.md b/README.md
index 5337d93c8..65c9e9e76 100644
--- a/README.md
+++ b/README.md
@@ -6,23 +6,30 @@ Here's the [YouTube Video](https://youtu.be/9AXP7tCI9PI).
 
 ## Installation
 
-Install [Langchain](https://github.com/hwchase17/langchain) and other required packages.
-```
-pip install langchain openai chromadb tiktoken unstructured
+Install [Langchain](https://github.com/hwchase17/langchain) and other required packages. And, use python version 3.9 64bit.
+
+```sh {"id":"01HK4NXTB4EC9T3SR797GCDYV7"}
+pip install langchain openai chromadb==0.3.29 tiktoken unstructured unstructured[pdf]
 ```
+
 Modify `constants.py.default` to use your own [OpenAI API key](https://platform.openai.com/account/api-keys), and rename it to `constants.py`.
 
 Place your own data into `data/data.txt`.
 
 ## Example usage
+
 Test reading `data/data.txt` file.
-```
+
+```sh {"id":"01HK4NXTB4EC9T3SR79A5R70JM"}
 > python chatgpt.py "what is my dog's name"
 Your dog's name is Sunny.
+
 ```
 
 Test reading `data/cat.pdf` file.
-```
+
+```sh {"id":"01HK4NXTB4EC9T3SR79DCGAS5K"}
 > python chatgpt.py "what is my cat's name"
 Your cat's name is Muffy.
+
 ```