From 511c12dd3985ce682226371c12f8fa70d8c9a8e1 Mon Sep 17 00:00:00 2001
From: warjiang <1096409085@qq.com>
Date: Thu, 8 Jun 2023 22:32:51 +0800
Subject: [PATCH] fix: update qa_chain doc for "chai_type" (#5877)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

<!--
Thank you for contributing to LangChain! Your PR will appear in our
release under the title you set. Please make sure it highlights your
valuable contribution.

Replace this with a description of the change, the issue it fixes (if
applicable), and relevant context. List any dependencies required for
this change.

After you're done, someone will review your PR. They may suggest
improvements. If no one reviews your PR within a few days, feel free to
@-mention the same people again, as notifications can get lost.

Finally, we'd love to show appreciation for your contribution - if you'd
like us to shout you out on Twitter, please also include your handle!
-->
`load_qa_with_sources_chain` method already support four type of chain,
including `map_rerank`. update document to prevent any misunderstandings
😀.

![image](https://github.com/hwchase17/langchain/assets/6478745/325260b2-6121-4900-aef9-001febff811a)

<!-- Remove if not applicable -->

Fixes # (issue)
No, just update document.

#### Before submitting

<!-- If you're adding a new integration, please include:

1. a test for the integration - favor unit tests that does not rely on
network access.
2. an example notebook showing its use


See contribution guidelines for more information on how to write tests,
lint
etc:


https://github.com/hwchase17/langchain/blob/master/.github/CONTRIBUTING.md
-->

#### Who can review?
@hwchase17
Tag maintainers/contributors who might be interested:

<!-- For a quicker response, figure out the right person to tag with @

  @hwchase17 - project lead

  Tracing / Callbacks
  - @agola11

  Async
  - @agola11

  DataLoaders
  - @eyurtsev

  Models
  - @hwchase17
  - @agola11

  Agents / Tools / Toolkits
  - @vowelparrot

  VectorStores / Retrievers / Memory
  - @dev2049

 -->
---
 langchain/chains/qa_with_sources/loading.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/langchain/chains/qa_with_sources/loading.py b/langchain/chains/qa_with_sources/loading.py
index 2ce4c56e..9eef4dc1 100644
--- a/langchain/chains/qa_with_sources/loading.py
+++ b/langchain/chains/qa_with_sources/loading.py
@@ -149,7 +149,7 @@ def load_qa_with_sources_chain(
     Args:
         llm: Language Model to use in the chain.
         chain_type: Type of document combining chain to use. Should be one of "stuff",
-            "map_reduce", and "refine".
+            "map_reduce", "refine" and "map_rerank".
         verbose: Whether chains should be run in verbose mode or not. Note that this
             applies to all chains that make up the final chain.