fixup! [11.0][MIG] bank_statement_foreing_currency

bank_statement_foreign_currency/README.rst

@@ -8,6 +8,21 @@ Bank Statement Foreign Currency
 
 This module makes visible the currency columns in the bank statements lines.
 
+Notice that all banks will provide the amounts in the account's main
+currency and in the foreign currency. You are not supposed to rely on
+Odoo's currency rate of the moment. The exchange rate is given by the bank.
+
+For example, You buy a widget in Amazon.com for $100.
+
+You can see in your statement:
+Amazon.com -80€ (-$100)
+
+Then you enter exactly this in Odoo's bank statement. The rate 80€/$100 is the
+rate that the bank applied to the payment you made in USD in Amazon.com,
+because your bank account is held in EUR. You need the $100 to be able to
+reconcile with the invoice, and you need the €80 because that's what hit your
+bank.
+
 Usage
 =====