diff --git a/langchain/chains/qa_with_sources/loading.py b/langchain/chains/qa_with_sources/loading.py
index 2ce4c56ea25..9eef4dc1a57 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.