diff --git a/aider/website/docs/llms/deepseek.md b/aider/website/docs/llms/deepseek.md
index d1f8ebfbf..c49c49c7e 100644
--- a/aider/website/docs/llms/deepseek.md
+++ b/aider/website/docs/llms/deepseek.md
@@ -6,6 +6,7 @@ nav_order: 500
 # DeepSeek
 
 Aider can connect to the DeepSeek.com API.
+To work with DeepSeek's models, you need to set the `DEEPSEEK_API_KEY` environment variable with your [DeepSeek API key](https://platform.deepseek.com/api_keys).  
 The DeepSeek Chat V3 model has a top score on aider's code editing benchmark.
 
 ```