diff --git a/env.example b/env.example
index 73f2d7b7..7a41daa4 100644
--- a/env.example
+++ b/env.example
@@ -50,6 +50,8 @@ OLLAMA_EMULATING_MODEL_TAG=latest
 # JWT_ALGORITHM=HS256
 
 ### API-Key to access LightRAG Server API
+### Use this key in HTTP requests with the 'X-API-Key' header
+### Example: curl -H "X-API-Key: your-secure-api-key-here" http://localhost:9621/query
 # LIGHTRAG_API_KEY=your-secure-api-key-here
 # WHITELIST_PATHS=/health,/api/*