diff --git a/README.md b/README.md
index b0ac633..1c3cac9 100644
--- a/README.md
+++ b/README.md
@@ -5,27 +5,41 @@ HTTP proxy for LLM APIs with streaming support and chunk processing.
 ## Usage
 
 ```bash
-./llm-proxy
+./llm-proxy          Start the proxy
+./llm-proxy -h      Show help
 ```
 
 ## Configuration
 
-| Variable | Description | Default |
-|----------|-------------|---------|
-| `UPSTREAM_URL` | Upstream LLM API URL | `https://api.openai.com/v1/chat/completions` |
-| `LISTEN_ADDR` | Listen address | `:8080` |
-| `API_KEY` | Upstream API key | - |
-| `INSECURE` | Skip TLS verification | `false` |
+Configuration file (optional): `llm-proxy.toml`
+
+Environment variables take priority over config file.
+
+| Variable | Alternative | Description | Default |
+|----------|-------------|-------------|---------|
+| `UPSTREAM_URL` | `OPENAI_API_BASE` | Upstream LLM API URL | `https://api.openai.com/v1/chat/completions` |
+| `LISTEN_ADDR` | - | Listen address | `127.0.0.1:8080` |
+| `API_KEY` | `OPENAI_API_KEY` | Upstream API key | - |
+| `INSECURE` | - | Skip TLS verification | `false` |
 
 ## Example
 
 ```bash
+# Via environment variables
 UPSTREAM_URL=https://api.openai.com/v1/chat/completions \
 API_KEY=sk-... \
-LISTEN_ADDR=:8080 \
+LISTEN_ADDR=127.0.0.1:8080 \
 ./llm-proxy
 ```
 
+```toml
+# Via config file (llm-proxy.toml)
+upstream_url = "https://api.openai.com/v1/chat/completions"
+listen_addr = "127.0.0.1:8080"
+api_key = "sk-..."
+insecure = false
+```
+
 ## Endpoints
 
 - `GET /health` - Health check