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annotation/README_MERGE.md

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+# Large File Merge Instructions
+
+## Overview
+
+Some large files have been split into 1GB chunks for easier upload/download. The split files are stored in dedicated `*_files/` directories alongside the original file location.
+
+## Files that need merging
+
+- `kb_index.faiss` (25.3 GB) 
+  - Split into ~26 parts in `2M_kb_eval/echosight_evqa_2M_kb/kb_index_files/`
+
+## How to Merge
+
+After downloading this dataset, navigate to the specific `*_files/` directory and run the merge script:
+
+```bash
+cd annotation/2M_kb_eval/echosight_evqa_2M_kb/kb_index_files/
+python merge_chunks.py
+```
+
+This will automatically:
+1. Detect all `.part*` files in current directory
+2. Merge them back into the complete file (e.g., `kb_index.faiss`)
+3. Place the merged file in the parent directory (`../`)
+4. Optionally delete the `.part` files after successful merge
+
+## Requirements
+
+- Python 3.6+
+- Sufficient disk space (at least 2x the size of the largest file during merge)
+
+## Verification
+
+After merging, verify the file exists in the parent directory:
+```bash
+ls -lh ../kb_index.faiss
+```
+
+Expected size: ~25.3 GB