Update README.md

README.md

@@ -90,6 +90,7 @@ we can evaluate the certainty and hallucination status of this reply by invoking
 
 ### Intrinsics Example with PDL
 Given a hosted instance of **Granite Intrinsics 3.0 8b Instruct v0.1** at `API_BASE` (insert the host address here), this uses the [PDL language](https://github.com/IBM/prompt-declaration-language) to implement the RAG intrinsic invocation scenario described above.
+Note that the hosted instance must be supported by LiteLLM ([https://docs.litellm.ai/docs/providers](https://docs.litellm.ai/docs/providers))
 
 First, create a file `intrinsics.pdl` with the following content.
 ```