Update Readme with arxiv citation key

README.md

@@ -87,6 +87,24 @@ ds_filtered = ds["train"].filter(lambda x: x["revenue"] is not None)
 - **OCR text**: DeepSeek OCR applied to annual report PDFs from SEC EDGAR, LSE, ASX, and other exchanges.
 - **KPI values**: SEC EDGAR (XBRL companyfacts) for US listings; yfinance for non-US; Alpha Vantage for gap-fill.
 
-## Citation
+## Citation key
 
-If you use this dataset, please cite LEDGER (citation key comming soon).
+If you use LEDGER datasets and / or code ressources, please consider citing our work with:
+
+```
+@misc{moslonka2026ledgerlongcontextbenchmarkcorporate,
+      title={LEDGER: A Long-Context Benchmark of Corporate Annual Reports for Grounded Financial Retrieval and Extraction}, 
+      author={Charles Moslonka and Amaury de Vitry and Arthur Garnier and Hicham Randrianarivo and Emmanuel Malherbe},
+      year={2026},
+      eprint={2606.13100},
+      archivePrefix={arXiv},
+      primaryClass={cs.CL},
+      url={https://arxiv.org/abs/2606.13100}, 
+}
+```
+
+## Links
+
+- **Collection**: [artefactory/ledger](https://huggingface.co/collections/artefactory/ledger)
+- **Code**: [github.com/artefactory/LEDGER](https://github.com/artefactory/LEDGER)
+- **ArXiv** [https://arxiv.org/abs/2606.13100](https://arxiv.org/abs/2606.13100)