Update README.md

README.md

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 ## How to use advanced vllm options
 Description of each option  
 ```--compilation_config '{"full_cuda_graph": true}'``` : Activates cuda [full graph capture](https://docs.vllm.ai/en/stable/design/cuda_graphs/#cudagraphmodes)  
-```--rope-scaling '{"rope_type":"yarn","factor":2.0,"original_max_position_embeddings":65536}'```: Apply [yarn](https://arxiv.org/abs/2309.00071)  
+```--rope-scaling '{"rope_type":"yarn","factor":2.0,"original_max_position_embeddings":65536}'```: Apply [yarn](https://arxiv.org/abs/2309.00071) to support 128K context length  
 ```--enable-auto-tool-choice --tool-call-parser hermes``` : Enables [tool calling](https://docs.vllm.ai/en/latest/features/tool_calling/)  
 ```--logits-processors logit_:WrappedPerReqLogitsProcessor``` : Enables VLLM_THINK_BUDGET_RATIO env variable and repetition-based auto-stop for thinking autostop  
 ```--reasoning-parser deepseek_r1``` : Parses [reasoning outputs](https://docs.vllm.ai/en/latest/features/reasoning_outputs/)