diff --git a/beesdoo_purchase/README.rst b/beesdoo_purchase/README.rst
index b268c6b..35bb0bf 100644
--- a/beesdoo_purchase/README.rst
+++ b/beesdoo_purchase/README.rst
@@ -34,6 +34,15 @@ purchase order.
 .. contents::
    :local:
 
+Configuration
+=============
+
+The setting *Invert Purchase Order Reference on invoice line* needs to be checked.
+This can be done in these following ways:
+
+* on the Access Rights (Technical Settings) of the user (Invert Purchase Order Reference on invoice line)
+* on the Invoicing Settings inside of the section `Invoices` (Allow inverting the Purchase Order Reference on the invoice lines)
+
 Bug Tracker
 ===========
 
diff --git a/beesdoo_purchase/readme/CONFIGURE.rst b/beesdoo_purchase/readme/CONFIGURE.rst
new file mode 100644
index 0000000..fcce31a
--- /dev/null
+++ b/beesdoo_purchase/readme/CONFIGURE.rst
@@ -0,0 +1,5 @@
+The setting *Invert Purchase Order Reference on invoice line* needs to be checked.
+This can be done in these following ways:
+
+* on the Access Rights (Technical Settings) of the user (Invert Purchase Order Reference on invoice line)
+* on the Invoicing Settings inside of the section `Invoices` (Allow inverting the Purchase Order Reference on the invoice lines)