diff --git a/fern/openai-realtime.mdx b/fern/openai-realtime.mdx
index e82ac8be..3e0e6621 100644
--- a/fern/openai-realtime.mdx
+++ b/fern/openai-realtime.mdx
@@ -12,5 +12,5 @@ OpenAI’s Realtime API enables developers to use a native speech-to-speech mode
 
 To start using it with your Vapi assistants, select `gpt-4o-realtime-preview-2024-10-01` as your model. 
 - Please note that only OpenAI voices may be selected while using this model. The voice selection will not act as a TTS (text-to-speech) model, but rather as the voice used within the speech-to-speech model.
-- Also note that we don’t currently support Knowledge Bases with the Realtime API.
+- Also note that we don’t currently support Knowledge Bases with the Realtime API. Furthermore, advanced functionality is currently limited with the latest voices Ash, Ballad, Coral, Sage and Verse.
 - Lastly, note that our Realtime integration still retains the rest of Vapi's orchestration layer such as the endpointing and interruption models to enable a reliable conversational flow.
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