mention LiteLLM

README.md

@@ -189,6 +189,9 @@ If you paste Banks' output into ChatGPT you would get something like this:
 Climate change is a pressing global issue, but together we can create positive change! Let's embrace renewable energy, protect our planet, and build a sustainable future for generations to come. 🌍💚 #ClimateAction #PositiveFuture
 ```
 
+The `generate` extension uses [LiteLLM](https://github.com/BerriAI/litellm) under the hood, and provided you have the
+proper environment variables set, you can use any model from the supported [model providers](https://docs.litellm.ai/docs/providers).
+
 ### Go meta: create a prompt and `generate` its response
 
 We can leverage Jinja's macro system to generate a prompt, send the result to OpenAI and get a response.