Update app.py

app.py

@@ -68,7 +68,7 @@ async def init():
     chain = RetrievalQA.from_chain_type(
         ChatOpenAI(model="gpt-3.5-turbo", temperature=0.7, streaming=True),
         chain_type="stuff",
-        return_source_documents=False,
+        return_source_documents=True,
         retriever=docsearch.as_retriever(),
         chain_type_kwargs = {"prompt": prompt}
     )