Update app.py

app.py

@@ -21,13 +21,17 @@ import os  # For handling file and directory paths.
 # Import a handler for streaming outputs.
 from langchain.callbacks.streaming_stdout import StreamingStdOutCallbackHandler  # For live updates in the Streamlit app.
 
-# Set the title of the Streamlit web application.
 st.title("ChatPDF")
+
+st.markdown("""
+ChatPDF is a web application that can answer questions based on a PDF document. To use the app, simply upload a PDF file and type your question in the input box. The app will then use a powerful language model to generate an answer to your question.
+""")
+
 # Create a visual separator in the app.
 st.write("---")
 
 # Add a file uploader widget for users to upload their PDF files.
-uploaded_file = st.file_uploader("Upload your PDF file!", type=['pdf'])
+uploaded_file = st.sidebar.file_uploader("Upload your PDF file!", type=['pdf'])
 # Another visual separator after the file uploader.
 st.write("---")