Update README.md

README.md

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 This dataset contains 500 sentence pairs in Sinhala, provided in two scripts: Unicode Sinhala and Romanized Sinhala. It is intended for evaluating perplexity and benchmarking language models on Sinhala text.
 
+This dataset was introduced and used in the following benchmark study:
+
+> Rajapakse, M., & Weerasinghe, R. (2025). *Script Sensitivity: Benchmarking Language Models on Unicode, Romanized and Mixed-Script Sinhala*. arXiv:2601.14958v2. https://arxiv.org/abs/2601.14958v2
+
+If you use this dataset, please cite the above paper.
+
+## Citation
+```bibtex
+@article{rajapakse2026comprehensive,
+  title={A Comprehensive Benchmark of Language Models on Unicode and Romanized Sinhala},
+  author={Rajapakse, Minuri and Weerasinghe, Ruvan},
+  journal={arXiv preprint arXiv:2601.14958},
+  year={2026}
+}
+```
 ## Dataset Structure
 
 The dataset consists of two fields: