diff --git a/langchain/chains/question_answering/__init__.py b/langchain/chains/question_answering/__init__.py
index 522f7906..2ba684f0 100644
--- a/langchain/chains/question_answering/__init__.py
+++ b/langchain/chains/question_answering/__init__.py
@@ -196,7 +196,7 @@ def load_qa_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", "map_rerank", and "refine".
         verbose: Whether chains should be run in verbose mode or not. Note that this
             applies to all chains that make up the final chain.
         callback_manager: Callback manager to use for the chain.