diff --git a/README.md b/README.md
index 7716aed..2e1ee6d 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,8 @@ to the Banqup API of Unifiedpost.
 
 **How to run this application**
 
-`python3 extract-invoice.py <documentNo>`
+* Copy the file `config-sample.py` to `config.py`
+* Edit `config.py` with your credentials for Openbravo and Banqup
+* Run `python3 extract-invoice.py <documentNo>`
 
 Where `<documentNo>` is the human readable invoice number in Openbravo.