Update README.md

README.md

@@ -176,4 +176,7 @@ This project demonstrates the integration of ontological knowledge with RAG syst
 
 ## License
 
-This project is licensed under the MIT License - see the license file for details.
+This project is licensed under the MIT License - see the license file for details.
+
+## Reference:
+Sharma, K., Kumar, P. and Li, Y., 2024. OG-RAG: Ontology-Grounded Retrieval-Augmented Generation For Large Language Models. arXiv preprint arXiv:2412.15235. Available at: https://arxiv.org/abs/2412.15235 [Accessed 16 Apr. 2025].