diff --git a/docs/modules/chains/combine_docs_examples/vector_db_qa_with_sources.ipynb b/docs/modules/chains/combine_docs_examples/vector_db_qa_with_sources.ipynb
index 6457338e..daacb4ad 100644
--- a/docs/modules/chains/combine_docs_examples/vector_db_qa_with_sources.ipynb
+++ b/docs/modules/chains/combine_docs_examples/vector_db_qa_with_sources.ipynb
@@ -163,7 +163,7 @@
    "source": [
     "from langchain.chains.qa_with_sources import load_qa_with_sources_chain\n",
     "qa_chain = load_qa_with_sources_chain(OpenAI(temperature=0), chain_type=\"stuff\")\n",
-    "qa = VectorDBQAWithSourcesChain(combine_document_chain=qa_chain, vectorstore=docsearch)"
+    "qa = VectorDBQAWithSourcesChain(combine_documents_chain=qa_chain, vectorstore=docsearch)"
    ]
   },
   {