Update README.md

README.md

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 The dataset supports both open-loop behavior analysis and closed-loop personalized driving evaluation.
 
 
+## Dataset Statistics 
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+The full Person2Drive dataset contains driving records from 50 anonymized human drivers collected in closed-loop CARLA environments. The dataset covers 4 driving routes and is organized by driver-level folders under the `drivers/` directory. Each `driverXX/` folder contains route-level compressed archives and metadata files. 
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+The dataset is being progressively uploaded. Please refer to [`RELEASE_MANIFEST.md`](./RELEASE_MANIFEST.md) for the current upload status, and [`DATASET_DETAILS.md`](./DATASET_DETAILS.md) for more detailed dataset documentation.
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 ## Dataset Structure
 
 The dataset is organized by anonymized driver identifiers. Each driver folder contains route-level compressed archives and a corresponding metadata file.