---
myst:
html_meta:
title: AutoRAG - Prev Next Augmenter
description: Learn about passage augmenter module in AutoRAG
keywords: AutoRAG,RAG,Advanced RAG,Passage Augmenter,Prev Next Augmenter
---
# Prev Next Augmenter
This module is inspired by
LlamaIndex ["Forward/Backward Augmentation"](https://docs.llamaindex.ai/en/stable/examples/node_postprocessor/PrevNextPostprocessorDemo/).
It allows users to fetch additional passages.
## **Module Parameters**
- **num_passages** : The number of passages to add before and after the retrieved passage
Default is 1.
- **mode** : The mode of augmentation
- `prev`: add passages before the retrieved passage
- `next`: add passages after the retrieved passage
- `both`: add passages before and after the retrieved passage
Default is 'next.'
## **Example config.yaml**
```yaml
modules:
- module_type: prev_next_augmenter
num_passages: 1
mode: next
```