diff --git a/README.md b/README.md
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+---
+license: mit
+task_categories:
+- image-classification
+tags:
+- test
+- dataset-viewer-test
+- row-group-size-issue
+size_categories:
+- n<1K
+---
+
+# Test Dataset: viewer-test-large-images-fail
+
+**Purpose**: Demonstrate dataset viewer behavior with large images and row group sizing.
+
+## Dataset Details
+
+- **Number of images**: 50
+- **Total size**: ~632MB
+- **Average per image**: ~12.6MB
+
+## Expected Behavior
+
+50 large images (~14MB each, ~700MB total). With 100-row row groups, all images land in one ~700MB row group, exceeding the 300MB scan limit.
+
+**Prediction**: FAIL - Scan size limit exceeded
+
+## Technical Context
+
+The dataset viewer converts imagefolder datasets to parquet with:
+- Row group size: 100 rows (for image datasets)
+- Scan size limit: 300MB
+
+If all images end up in one row group and exceed 300MB, the viewer fails with:
+```
+Scan size limit exceeded: attempted to read X bytes, limit is 300000000 bytes
+```
+
+## Related Issue
+
+This dataset was created to help debug row group sizing for large images.
+See: https://github.com/huggingface/dataset-viewer for context.
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