diff --git a/wren-ai-service/docs/config_examples/config.ollama.yaml b/wren-ai-service/docs/config_examples/config.ollama.yaml
index 8b59fda6d..0500aee4f 100644
--- a/wren-ai-service/docs/config_examples/config.ollama.yaml
+++ b/wren-ai-service/docs/config_examples/config.ollama.yaml
@@ -16,6 +16,7 @@ models:
 type: embedder
 provider: litellm_embedder
 models:
+# put OPENAI_API_KEY=<random_string> in ~/.wrenai/.env
 - model: openai/nomic-embed-text  # put your ollama embedder model name here, openai/<ollama_model_name>
   api_base: http://host.docker.internal:11434/v1  # change this to your ollama host, api_base should be <ollama_url>/v1
   timeout: 120