Update README.md

README.md

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 > [!IMPORTANT]
 > This repository is a community-driven quantized version of the original model [`google/gemma-2-9b-it`](https://huggingface.co/google/gemma-2-9b-it) which is the BF16 half-precision official version released by Google.
 
+> [!WARNING]
+> This model has been quantized using `transformers` 4.45.0, meaning that the tokenizer available in this repository won't be compatible with lower versions. Same applies for e.g. Text Generation Inference (TGI) that only installs `transformers` 4.45.0 or higher starting in v2.3.1.
+
 ## Model Information
 
 Gemma is a family of lightweight, state-of-the-art open models from Google, built from the same research and technology used to create the Gemini models. They are text-to-text, decoder-only large language models, available in English, with open weights for both pre-trained variants and instruction-tuned variants. Gemma models are well-suited for a variety of text generation tasks, including question answering, summarization, and reasoning. Their relatively small size makes it possible to deploy them in environments with limited resources such as a laptop, desktop or your own cloud infrastructure, democratizing access to state of the art AI models and helping foster innovation for everyone.