diff --git a/README.md b/README.md
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+++ b/README.md
@@ -22,6 +22,7 @@ Like what we do? Want to join us? Check out our job listings on our [career page
***
* [Overview](#overview)
+* [Functionalities](doc/functionalities.md)
* [Support](#we-are-here-to-help)
* [Installation](#installation)
* [Testing](#testing)
diff --git a/doc/functionalities.md b/doc/functionalities.md
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+# Functionalities
+
+---
+### Introduction
+
+---
+Poczta Polska is Poland's national postal operator,
+which offers letter, parcel, and special delivery services both domestically and internationally.
+
+The plug-in allows you to order postal services from the Poczta Polska Service with a click of the mouse, without having to fill in the data each time.
+
+This plugin supports communication with the PocztaPolska API (Elektroniczny Nadawca wersja), including exporting shipping data
+and creating ready-made labels to print directly from the order.
+
+### Usage
+
+---
+#### Adding Shipping Gate
+
+After installation, users can add the shipping method corresponding to the service provider
+to which they want to export shipments.
+
+
+
+
+
+It then creates a new "shipping gateway" for the added shipping method.
+When a customer selects this shipping method when ordering products, the order will be captured by the gateway.
+
+
+
+
+Selects the shipping method and completes the form fields accordingly.
+
+
+
+
+
+#### API options
+
+It is possible to select:
+
+
+
+
+
+Determine the payment page:
+- Sender
+- Recipient
+- Third party
+
+Payment method:
+- Bank transfer
+- Cash payment
+
+Type of request:
+- Create the shipment and order the courier
+- Order courier
+- Creating a shipment without restriction
+
+Type of transport service:
+- Domestic shipment
+- Service Domestic 09
+- Service Domestic 12
+- Shipment Connect
+- Shipment International
+
+**_Shipment start hour_**:
+Specifies the time from which the shipment is ready for collection by the courier
+
+**_Shipment end hour_**:
+Specifies the end time by which the courier can arrive to pick up the shipment.
+After this hour, the shipment may no longer be available for pickup.
+
+**_Pickup breaking hour_**:
+Specifies the cut-off time by which the courier can come to pick up the shipment.
+This is the hour after which the collection of the shipment will be postponed to the next business day.
+
+
+
+
+#### Shipping Exports
+Once the shipping method and shipping gateway for the shipping provider are created,
+customer can use this shipping method during a checkout. When the order is placed,
+user can now go to the 'Export shipping data' section from Sylius Admin Panel and export chosen shipments.
+
+After exporting the shipment, it is possible to download the label for printing.
+
+
+