diff --git a/README.md b/README.md
index 177375e..982dc15 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+
+
 # browsegrab
 
 > [한국어 문서](README.ko.md) · [llms.txt](llms.txt)
@@ -174,6 +176,7 @@ BROWSEGRAB_BROWSER_TIMEOUT_MS=30000
 BROWSEGRAB_LLM_PROVIDER=vllm          # vllm | ollama | openai
 BROWSEGRAB_LLM_BASE_URL=http://localhost:8000/v1
 BROWSEGRAB_LLM_MODEL=Qwen/Qwen3.5-32B-AWQ
+BROWSEGRAB_LLM_API_KEY=sk-...         # Optional, required for OpenAI-compatible endpoints
 
 # Agent
 BROWSEGRAB_AGENT_MAX_STEPS=10