diff --git a/aider/website/docs/troubleshooting/models-and-keys.md b/aider/website/docs/troubleshooting/models-and-keys.md
index 8c6af3543..06fbc9722 100644
--- a/aider/website/docs/troubleshooting/models-and-keys.md
+++ b/aider/website/docs/troubleshooting/models-and-keys.md
@@ -5,7 +5,27 @@ nav_order: 28
 
 # Models and API keys
 
-You need to tell aider which LLM to use and provide an API key.
+Aider needs to know which LLM model you would like to work with and which keys
+to provide when accessing it via API.
+
+## Defaults
+
+If you don't explicitly name a model, aider will try to select a model
+for you to work with.
+
+First, aider will check which 
+[keys you have provided via the environment, config files, or command line arguments](https://aider.chat/docs/config/api-keys.html).
+Based on the available keys, aider will select the best model to use.
+
+If you have not provided any keys, aider will offer to help you connect to 
+[OpenRouter](http://openrouter.ai)
+which provides both free and paid access to most popular LLMs.
+Once connected, aider will select the best model available on OpenRouter
+based on whether you have a free or paid account there.
+
+## Specifying model & key
+
+You can also tell aider which LLM to use and provide an API key.
 The easiest way is to use the `--model` and `--api-key`
 command line arguments, like this: