Update app.py

app.py

@@ -135,12 +135,14 @@ def extract_invoice_gemini(page: fitz.Page) -> Optional[str]:
         img = Image.open(io.BytesIO(pix.tobytes("png")))
 
         prompt = """
-        Extract the invoice number from this invoice image.
+        Extract the invoice number from this invoice image,
+         also consider for reading an Indian GST e-Invoice.
 
         Look for:
         - Invoice No
         - Bill No
         - Tax Invoice No
+        - Document No
         - Purchase Order No (only if invoice not present)
 
         Return ONLY the identifier.