diff --git a/langchain/chains/vector_db_qa/base.py b/langchain/chains/vector_db_qa/base.py
index d6f7ab6f66..1788d962a7 100644
--- a/langchain/chains/vector_db_qa/base.py
+++ b/langchain/chains/vector_db_qa/base.py
@@ -24,7 +24,7 @@ class VectorDBQA(Chain, BaseModel):
             from langchain import OpenAI, VectorDBQA
             from langchain.faiss import FAISS
             vectordb = FAISS(...)
-            vectordbQA = VectorDBQA(llm=OpenAI(), vector_db=vectordb)
+            vectordbQA = VectorDBQA(llm=OpenAI(), vectorstore=vectordb)
 
     """