Update app.py

app.py

@@ -11,11 +11,13 @@ from langchain_core.output_parsers import StrOutputParser
 from langchain_core.runnables import RunnablePassthrough
 import glob
 import gradio as gr
-
+from langchain_huggingface import HuggingFaceEndpoint
 from langchain_community.embeddings import HuggingFaceInferenceAPIEmbeddings
 
 import os
 
+# I learned a lot from https://huggingface.co/learn/cookbook/en/rag_zephyr_langchain. If you want to learn RAG, check it out.
+
 secret_value_hf = os.getenv("hf_token")
 
 hf_embeddings = HuggingFaceInferenceAPIEmbeddings(