diff --git a/doc/functionalities.md b/doc/functionalities.md
index 7cf7f0c..bed0022 100644
--- a/doc/functionalities.md
+++ b/doc/functionalities.md
@@ -4,6 +4,8 @@
 
 The plugin integrates PayU Poland payments with Sylius based applications.
 
+> For the plugin to work correctly, `base currency` should be set to `Polish Zloty` in the Sylius admin panel.
+
 After an installation, user should be able to create new PayU payment method in the "Payment methods" section in the admin panel.
 
 <div align="center">
@@ -17,3 +19,8 @@ Once there, user can fill out the configuartion form with all the needed info li
 </div>
 
 After this, created payment method should be visible in the checkout.
+
+<div align="center">
+    <img src="./images/payu_checkout.png"/>
+</div>
+
diff --git a/doc/images/payu_checkout.png b/doc/images/payu_checkout.png
new file mode 100644
index 0000000..74c4f78
Binary files /dev/null and b/doc/images/payu_checkout.png differ
diff --git a/doc/installation.md b/doc/installation.md
index ef075f1..c75340b 100644
--- a/doc/installation.md
+++ b/doc/installation.md
@@ -48,6 +48,9 @@ bin/console cache:clear
 **Note:** If you are running it on production, add the `-e prod` flag to this command.
 
 ## Known issues
+
+> For the plugin to work correctly, `base currency` should be set to `Polish Zloty` in the Sylius admin panel.
+
 ### Translations not displaying correctly
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