Update README.md

README.md

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-license: apache-2.0
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-This dataset represents the source PDFs and rules used in  olmOCR-bench.
-
-This benchmark is meant to easily evaluate OCR quality across a variety of models.
+---
+license: apache-2.0
+---
+
+# olmOCR-bench
+
+olmOCR-bench is a dataset of 1,403 PDF files, plus 7,010 unit test cases that capture properties of the output that a good OCR system should have.
+
+Quick links:
+- 📃 [Paper](https://olmocr.allenai.org/papers/olmocr.pdf)
+- 🛠️ [Code](https://github.com/allenai/olmocr)
+- 🎮 [Demo](https://olmocr.allenai.org/)
+
+## Table 1. Distribution of Test Classes by Document Source
+
+| Document Source | Text Present | Text Absent | Reading Order | Table | Math | Total |
+|----------------|--------------|-------------|---------------|-------|------|-------|
+| arXiv Math     | -            | -           | -             | -     | 2,927| 2,927 |
+| Headers Footers| -            | 753         | -             | -     | -    | 753   |
+| Long Tiny Text | 442          | -           | -             | -     | -    | 442   |
+| Multi Column   | -            | -           | 884           | -     | -    | 884   |
+| Old Scans      | 279          | 70          | 177           | -     | -    | 526   |
+| Old Scans Math | -            | -           | -             | -     | 458  | 458   |
+| Table Tests    | -            | -           | -             | 1,020 | -    | 1,020 |
+| **Total**      | 721          | 823         | 1,061         | 1,020 | 3,385| 7,010 |
+
+
+## Table 2. Document source category breakdown
+
+| **Category** | **PDFs** | **Tests** | **Source** | **Extraction Method** |
+|--------------|----------|-----------|------------|------------------------|
+| arXiv_math | 522 | 2,927 | arXiv | Dynamic programming alignment |
+| old_scans_math | 36 | 458 | Internet Archive | Script-generated + manual rules |
+| tables_tests | 188 | 1,020 | Internal repository | `gemini-flash-2.0` |
+| old_scans | 98 | 526 | Library of Congress | Manual rules |
+| headers_footers | 266 | 753 | Internal repository | DocLayout-YOLO + `gemini-flash-2.0` |
+| multi_column | 231 | 884 | Internal repository | `claude-sonnet-3.7` + HTML rendering |
+| long_tiny_text | 62 | 442 | Internet Archive | `gemini-flash-2.0` |
+| **Total** | 1,403 | 7,010 | Multiple sources | |