Update README.md

README.md

@@ -40,6 +40,13 @@ Model | Sample Rate | Frame Rate | Bit Rate   | # Codebooks | Codebook Size | Em
 [0.6kbps-12.5fps](https://huggingface.co/nvidia/nemo-nano-codec-22khz-0.6kbps-12.5fps) | 22050       | 12.5      | 0.6kpbs   | 4          | 4032          | 16          | [9, 8, 8, 7] |
 [1.89kbps-21.5fps](https://huggingface.co/nvidia/nemo-nano-codec-22khz-1.89kbps-21.5fps) | 22050       | 21.5       | 1.89kpbs   | 8          | 2016          | 32          | [8, 7, 6, 6] |
 
+⚠️ **Note on 0.6kbps-12.5fps**  
+This variant is designed for **fine-tuning with a limited set of speakers**, as shown in our [S2S Duplex paper](https://www.isca-archive.org/interspeech_2025/hu25f_interspeech.html).  
+It is **not recommended** for general-purpose audio encoding or decoding.
+
+ℹ️ **Recommended Variants**  
+Both **1.78kbps-12.5fps** and **1.89kbps-21.5fps** achieve similar audio reconstruction quality.  
+However, our [Magpie TTS](https://build.nvidia.com/nvidia/magpie-tts-multilingual) model performs best with **1.89kbps-21.5fps**.
 
 ## License/Terms of Use
 [NVIDIA Open Model License Agreement](https://developer.download.nvidia.com/licenses/nvidia-open-model-license-agreement-june-2024.pdf)