diff --git a/README.md b/README.md
index b187bb7e7d837a367ccd0862441947ad412c77f7..c4f1cc25b2194198ec705b689ad8c638cdcbc7eb 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,130 @@
 ---
+pretty_name: CountVideoBench
 license: cc-by-4.0
+language:
+  - en
+task_categories:
+  - video-text-to-text
+  - visual-question-answering
+size_categories:
+  - 1K<n<10K
+tags:
+  - video
+  - counting
+  - benchmark
+  - video-language-models
+  - synthetic
+  - blender
+configs:
+  - config_name: single_class
+    default: true
+    drop_labels: true
+    data_files:
+      - split: test
+        path: "single_class/**"
 ---
+
+# CountVideoBench
+
+**A benchmark to evaluate prediction biases on the object counting task by video-language models.**
+
+Marc Chapus, Carlos Crispim-Junior, Véronique Eglin, Atilla Baskurt
+LIRIS, UMR 5205 — INSA Lyon, Université Lumière Lyon 2, CNRS, Université Claude Bernard Lyon 1
+
+**BMVC 2026**
+
+## Dataset summary
+
+CountVideoBench contains **2,600 synthetic videos** rendered with Blender, each showing a known number of identical objects. It is designed to isolate *cardinality* as the variable under study:
+
+- **Balanced by cardinality**: 26 counts between 5 and 50, with exactly 100 videos per count. The counts are organised in clusters around six anchors (5, 10, 20, 30, 40, 50), each anchor with its neighbours at ±1 and ±2, so that accuracy can be compared across near-identical inputs:
+  `5–12, 18–22, 28–32, 38–42, 48–50`.
+- **Recognition kept simple**: each video contains a single object class among 10 (2 shapes × 5 colours), with exactly 10 videos per class and per count.
+- **Static objects, moving camera**: objects are static and the camera rotates in place. The white background carries a regular line pattern, and object surfaces a low-amplitude procedural noise, so that densely packed objects stay visually distinct.
+- **Exact ground truth**: counts come from the generation process, with no human annotation.
+
+The benchmark is far from saturated: humans reach 90.8% exact-match accuracy, while no model evaluated in the paper exceeds 27.6%.
+
+## Example
+
+![Preview of vid_001001: 20 red cubes, rotating camera](https://countvideobench.github.io/static/vid_001001.webp)
+
+**Video**: [`single_class/20_entities/vid_001001.mp4`](single_class/20_entities/vid_001001.mp4) (preview above, downscaled) — red cubes, 150 frames.
+
+**Question**: How many red cubes are in this video?
+
+**Answer**: 20
+
+The `question` field of each video holds the exact prompt used in the paper. Using it unchanged keeps results comparable with those reported there.
+
+## Dataset structure
+
+```
+single_class/
+├── metadata.csv
+├── 05_entities/
+│   ├── vid_000001.mp4
+│   ├── ...
+│   └── vid_000100.mp4
+├── 06_entities/
+├── ...
+└── 50_entities/
+```
+
+Each folder holds the 100 videos of one count. `metadata.csv` has one row per video:
+
+| Field       | Type   | Description                                      |
+| ----------- | ------ | ------------------------------------------------ |
+| `file_name` | string | Path to the video, relative to `single_class/`   |
+| `video_id`  | string | Unique identifier (`vid_000001` to `vid_002600`) |
+| `count`     | int    | Ground-truth number of objects                   |
+| `shape`     | string | `cube` or `sphere`                               |
+| `color`     | string | `red`, `green`, `blue`, `yellow` or `purple`     |
+| `question`  | string | Question asked to the model                      |
+
+Videos: MP4, 1920 × 1080, 30 fps, 5 seconds (150 frames). The full clips are provided so that users can choose their own frame sampling strategy.
+
+## Usage
+
+```python
+from datasets import load_dataset
+
+ds = load_dataset("countvideobench/CountVideoBench", "single_class", split="test")
+print(ds[0]["count"], ds[0]["question"])
+```
+
+To download the raw files instead:
+
+```bash
+hf download countvideobench/CountVideoBench --repo-type dataset --local-dir CountVideoBench
+```
+
+## Intended uses
+
+- Evaluating object counting in video-language models.
+- Diagnosing prediction biases per cardinality (preferred values, peaks and collapses in accuracy).
+- Comparing models under identical, controlled conditions.
+
+CountVideoBench is an evaluation benchmark: please do not use it as training data, so that reported results remain comparable.
+
+## Generation
+
+Videos were rendered procedurally with Blender. All generation parameters (rendering, camera, objects, placement, physics, lighting) are documented in Appendix B of the paper.
+
+## Citation
+
+If you use CountVideoBench, please cite:
+
+```bibtex
+@inproceedings{chapus2026countvideobench,
+  author    = {Chapus, Marc and Crispim-Junior, Carlos and Eglin, V{\'e}ronique and Baskurt, Atilla},
+  title     = {{CountVideoBench}: A Benchmark to Evaluate Prediction Biases on the Object Counting task by Video-Language Models},
+  booktitle = {37th British Machine Vision Conference 2026, {BMVC} 2026, Lancaster, UK, November 23-26, 2026},
+  publisher = {BMVA},
+  year      = {2026}
+}
+```
+
+## Contact
+
+Marc Chapus — marc.chapus@liris.cnrs.fr
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