diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3f2fa765..73ccf0e6 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -78,6 +78,7 @@ Now, navigate to the apps/api/ directory and run:
 
 ```bash
 pnpm run workers
+# if you are going to use the [llm-extract feature](https://github.com/mendableai/firecrawl/pull/586/), you should also export OPENAI_API_KEY=sk-______
 ```
 
 This will start the workers who are responsible for processing crawl jobs.