Update app.py

app.py

@@ -11,6 +11,17 @@ from langchain_community.embeddings import HuggingFaceEmbeddings
 from langchain.prompts import PromptTemplate
 from dotenv import load_dotenv
 
+"""
+### How to Use the App:
+
+1. **Upload PDF:** Upload PDF and click 'Process PDF' to add them to the knowledge base.
+2. **Ask a Question:** Switch to the 'Q&A System' tab, enter your question, and click 'Ask Question' to get an answer based on the uploaded PDF content.
+3. **Clear Data:** Click 'Clear Knowledge Base' to reset and remove all uploaded documents.
+
+Ensure a PDF is uploaded before asking questions.
+"""
+
+
 # Load environment variables
 load_dotenv()