diff --git a/README.md b/README.md
index ff1d7e8..0b50dbb 100644
--- a/README.md
+++ b/README.md
@@ -188,6 +188,20 @@ export ANTHROPIC_AUTH_TOKEN=sk-orca-your-key
 export ANTHROPIC_API_KEY=""
 ```
 
+Codex 接入（OpenAI 协议，base URL 带 `/v1`）：在 `~/.codex/config.toml` 里定义 provider 并选中：
+
+```toml
+model = "anthropic/claude-opus-4.8"
+model_provider = "orcarouter"
+
+[model_providers.orcarouter]
+name = "OrcaRouter"
+base_url = "https://api.orcarouter.ai/v1"
+env_key = "ORCAROUTER_API_KEY"
+```
+
+然后 `export ORCAROUTER_API_KEY=sk-orca-your-key` 即可。
+
 模型 ID 用 `vendor/model` 格式（如 `anthropic/claude-opus-4.8`），或者用 `orcarouter/auto` 让它按 prompt 自动选。
 
 ## License