Update README.md

README.md

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 This repository contains GGUF-v3 version (llama.cpp compatible) of **Chinese-Alpaca-2-1.3B-RLHF**, which is tuned on Chinese-Alpaca-2-1.3B with RLHF using DeepSpeed-Chat.
 
+**The optimal context length is 1K for this model. Specify `-c 1024` when using with llama.cpp**
+
 For full model in HuggingFace format, please see: https://huggingface.co/hfl/chinese-alpaca-2-1.3b-rlhf
 
 Please refer to [https://github.com/ymcui/Chinese-LLaMA-Alpaca-2/](https://github.com/ymcui/Chinese-LLaMA-Alpaca-2/) for more details.