Update README.md

README.md

@@ -20,9 +20,7 @@ configs:
 
 # BFD Source Archive Index
 
-This dataset contains the original BFD source archive plus a viewer-friendly compressed byte-range index. The source archive is about 292 GB, so the default Dataset Viewer table is an index over 1 GiB compressed chunks rather than a fully expanded sequence table.
-
-Use the original `bfd_metaclust_clu_complete_id30_c90_final_seq.sorted_opt.tar.gz` archive for complete sequence data. Use the default Parquet table for quick inspection, Dataset Viewer previews, and source-size/chunk metadata.
+BFD is a very large clustered protein sequence database built from UniProt and metagenomic sequence resources, commonly used for homology search and multiple sequence alignment generation.
 
 ## Splits
 
@@ -112,6 +110,16 @@ print(source_files)
 | `access_note` | Note describing the index scope. |
 | `split_bucket` | Deterministic split bucket from `sha256(index_id) % 10`. |
 
-## Preparation
+# Citation
 
-The normalization script used to create the Parquet files is included at `scripts/prepare_bfd_dataset.py`.
+```
+@article{steinegger2019bfd,
+  title   = {Protein-level assembly increases protein sequence recovery from metagenomic samples manyfold},
+  author  = {Steinegger, Martin and Mirdita, Milot and S{\"o}ding, Johannes},
+  journal = {Nature Methods},
+  volume  = {16},
+  pages   = {603--606},
+  year    = {2019},
+  doi     = {10.1038/s41592-019-0437-4}
+}
+```