diff --git a/README.md b/README.md
index f7e33fd..ec04c35 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,6 @@
 <img src="https://github.com/user-attachments/assets/4d3beba4-04e2-41e2-8645-0887cbde4b5c" width="240" /> 
 </div>
 
-
 # ggfigdone: Manage ggplot figures using ggfigdone
 [![R](https://github.com/wenjie1991/ggfigdone/actions/workflows/r.yml/badge.svg)](https://github.com/wenjie1991/ggfigdone/actions/workflows/r.yml)
 
@@ -15,9 +14,21 @@ You need to change the figure size, modify the title, label, themes, etc.
 It is inconvinient to go back to the original code to make these changes.
 This package provides a simple way to manage ggplot figures. 
 
-You can easily add the figure to the database and update them later using CLI (command line interface) or GUI (graphical user interface).
+## Features
+
+### Manage figures
+
+You can easily add the figure to the database and manage it later using CLI (command line interface) or GUI (graphical user interface).
+
+https://github.com/user-attachments/assets/7bcccfdd-e48d-49c7-9c18-ec0c41ee0481
+
+
 
-![ggfigdone_demo](https://github.com/user-attachments/assets/a0d4d01d-105a-4fc0-bda5-c7cc3e6dbd48)
+### Update figures by LLM
+
+Utilizing the LLM to convert your natural language idea into {ggplot2} code.
+
+https://github.com/user-attachments/assets/524a6d44-012d-4a55-8a5a-83b44f1ffadd
 
 ## Installation
 
@@ -35,7 +46,6 @@ remotes::install_github("wenjie1991/ggfigdone")
 ```
 
 
-
 ## Demo
 
 ### Initialize the database
@@ -79,6 +89,70 @@ fd_server("./fd_dir")
 ## Open the browser and go to http://localhost:8080/index.html
 ```
 
+## Configure LLM Service
+
+### LLM API key
+
+**OpenAI API**
+
+
+Please visit the OpenAI website at https://openai.com/ and follow the instructions in the video. You may need to update your payment methods.
+
+https://github.com/user-attachments/assets/e5fc4feb-5dc4-4473-826d-ec69b5c0d9a5
+
+
+**Free API key**
+
+
+You can access a free LLM service at this link: https://github.com/cheahjs/free-llm-api-resources
+
+The following video demonstrates how to apply the GroqCloud key for free.
+
+Link: https://console.groq.com/login
+
+
+https://github.com/user-attachments/assets/5624798a-1c86-4694-b7a0-69daaacf470f
+
+
+### Configure {ggfigdone}
+
+
+**Example: OpenAI service**
+
+The default configuration is the OpenAI service, where you only need to provide the OpenAI API key.
+
+```r
+fd_server("./fd_dir", 
+    llm_api_key = "sk-use_your_own_key_here"),
+)
+```
+
+**Example: Groq service**
+
+To use Croq or any other service, you must configure the parameters `llm_api_url`, `llm_api_key`, and `llm_model`.
+
+```r
+fd_server("./fd_dir", 
+    llm_api_url = "https://api.groq.com/openai/v1/chat/completions",
+    llm_api_key = "gsk_use_your_own_key_here"), 
+    llm_model = "llama-3.3-70b-versatile",
+)
+```
+
+### Set default service
+
+You can configure the default LLM service in `.Rprofile` using the following code.
+
+```r
+options(
+  llm_api_key = "gsk-use_your_own_key_here",
+  llm_api_url = "https://api.groq.com/openai/v1/chat/completions",
+  llm_model = "llama-3.3-70b-versatile",
+  llm_temperature = "0.5",
+  llm_max_tokens = 1000
+)
+```
+
 ## Contribution
 
 This package is being developed. Feel free to contribute to the package by sending pull requests or creating issues.