diff --git a/README.md b/README.md
index 6aaa9d5..1b8e372 100644
--- a/README.md
+++ b/README.md
@@ -7,12 +7,40 @@ Cargo.toml
 openai-api-rs = "0.1.5"
 ```
 
-## Example:
+## Usage
+The library needs to be configured with your account's secret key, which is available on the [website](https://platform.openai.com/account/api-keys). We recommend setting it as an environment variable. Here's an example of initializing the library with the API key loaded from an environment variable and creating a completion:
+
+### Set OPENAI_API_KEY to environment variable
 ```bash
-export OPENAI_API_KEY={YOUR_API_KEY}
+$ export OPENAI_API_KEY=sk-xxxxxxx
 ```
 
-### Chat
+### Create client
+```rust
+use openai_api_rs::v1::api::Client;
+use std::env;
+let client = Client::new(env::var("OPENAI_API_KEY").unwrap().to_string());
+```
+
+### Create request
+```rust
+use openai_api_rs::v1::chat_completion::{self, ChatCompletionRequest};
+let req = ChatCompletionRequest {
+    model: chat_completion::GPT4.to_string(),
+    messages: vec![chat_completion::ChatCompletionMessage {
+        role: chat_completion::MessageRole::user,
+        content: String::from("Hello OpenAI!"),
+    }],
+};
+```
+
+### Send request
+```rust
+let result = client.completion(req).await?;
+println!("{:?}", result.choices[0].text);
+```
+
+## Example of chat completion
 ```rust
 use openai_api_rs::v1::api::Client;
 use openai_api_rs::v1::chat_completion::{self, ChatCompletionRequest};
@@ -25,46 +53,23 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         model: chat_completion::GPT4.to_string(),
         messages: vec![chat_completion::ChatCompletionMessage {
             role: chat_completion::MessageRole::user,
-            content: String::from("NFTとは？"),
+            content: String::from("Hello OpenAI!"),
         }],
     };
     let result = client.chat_completion(req).await?;
     println!("{:?}", result.choices[0].message.content);
-
     Ok(())
 }
 ```
+Check out the [full API documentation](https://platform.openai.com/docs/api-reference/completions) for examples of all the available functions.
 
-### Completion
-```rust
-use openai_api_rs::v1::completion::{self, CompletionRequest};
-use openai_api_rs::v1::api::Client;
-use std::env;
-
-#[tokio::main]
-async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let client = Client::new(env::var("OPENAI_API_KEY").unwrap().to_string());
-    let req = CompletionRequest {
-        model: completion::GPT3_TEXT_DAVINCI_003.to_string(),
-        prompt: Some(String::from("NFTとは？")),
-        suffix: None,
-        max_tokens: Some(3000),
-        temperature: Some(0.9),
-        top_p: Some(1.0),
-        n: None,
-        stream: None,
-        logprobs: None,
-        echo: None,
-        stop: None,
-        presence_penalty: Some(0.6),
-        frequency_penalty: Some(0.0),
-        best_of: None,
-        logit_bias: None,
-        user: None,
-      };
-    let result = client.completion(req).await?;
-    println!("{:?}", result.choices[0].text);
-
-    Ok(())
-}
-```
+## Supported APIs
+- [x] [completions](https://platform.openai.com/docs/api-reference/completions)
+- [x] [Chat](https://platform.openai.com/docs/api-reference/chat)
+- [x] [Edits](https://platform.openai.com/docs/api-reference/edits)
+- [x] [Images](https://platform.openai.com/docs/api-reference/images)
+- [x] [Embeddings](https://platform.openai.com/docs/api-reference/embeddings)
+- [ ] [Audio](https://platform.openai.com/docs/api-reference/audio)
+- [x] [Files](https://platform.openai.com/docs/api-reference/files)
+- [ ] [Fine-tunes](https://platform.openai.com/docs/api-reference/fine-tunes)
+- [ ] [Moderations](https://platform.openai.com/docs/api-reference/moderations)