diff --git a/.gitignore b/.gitignore
index 536c4f0..dfbfd2e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@
 
 # rspec failure tracking
 .rspec_status
+.tool-versions
diff --git a/Gemfile b/Gemfile
index b4bf2ee..25f9d3e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,6 +7,12 @@ git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 # Specify your gem's dependencies in yookassa.gemspec
 gemspec
 
+group :documentation do
+  gem "rack"
+  gem "webrick"
+  gem "yard"
+end
+
 group :development, :test do
   gem "pry"
   gem "pry-byebug", "~> 3.8.0"
diff --git a/Gemfile.lock b/Gemfile.lock
index 2a7ca4a..f1995a9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -70,6 +70,7 @@ GEM
       byebug (~> 11.0)
       pry (~> 0.10)
     public_suffix (4.0.6)
+    rack (2.2.3)
     rainbow (3.0.0)
     rake (13.0.6)
     regexp_parser (2.1.1)
@@ -117,6 +118,8 @@ GEM
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
+    webrick (1.7.0)
+    yard (0.9.26)
 
 PLATFORMS
   ruby
@@ -124,6 +127,7 @@ PLATFORMS
 DEPENDENCIES
   pry
   pry-byebug (~> 3.8.0)
+  rack
   rake (~> 13.0)
   rspec (~> 3.5)
   rubocop (~> 1.22)
@@ -131,6 +135,8 @@ DEPENDENCIES
   rubocop-rspec (~> 2.5)
   simplecov (~> 0.16)
   webmock (~> 3.14)
+  webrick
+  yard
   yookassa!
 
 BUNDLED WITH
diff --git a/bin/yard b/bin/yard
new file mode 100755
index 0000000..39d4665
--- /dev/null
+++ b/bin/yard
@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'yard' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+                                           Pathname.new(__FILE__).realpath)
+
+bundle_binstub = File.expand_path("bundle", __dir__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("yard", "yard")
diff --git a/lib/yookassa/entity/refund.rb b/lib/yookassa/entity/refund.rb
index 920547b..5a81ec9 100644
--- a/lib/yookassa/entity/refund.rb
+++ b/lib/yookassa/entity/refund.rb
@@ -2,18 +2,45 @@
 
 require_relative "./types"
 require_relative "./amount"
+require_relative "./source"
 
 module Yookassa
   module Entity
     class Refund < Dry::Struct
-      attribute :id, Types::String
       attribute? :idempotency_key, Types::String
-      attribute :status, Types::String
+      # id [string, required]
+      # Refund's ID in YooMoney
+      attribute :id, Types::String
+
+      # payment_id [string, required]
+      # Payment ID in YooMoney
       attribute :payment_id, Types::String
+
+      # status [string, required]
+      # Refund status. Possible values: canceled, succeeded
+      attribute :status, Types::String.enum("canceled", "succeeded")
+
+      # receipt_registration [string, optional]
+      # Delivery status of receipt data to online sales register (pending, succeeded, or canceled).
+      # For those who use the solution for 54-FZ
+      attribute? :receipt_registration, Types::String.enum("pending", "succeeded", "canceled")
+
+      # created_at [string, required]
+      # Time to refund creation, based on UTC and specified in the ISO 8601 format, for example, 2017-11-03T11:52:31.827Z
       attribute :created_at, Types::String
+
+      # amount [object, required]
+      # Amount refunded to the user.
       attribute :amount, Entity::Amount
-      attribute? :receipt_registration, Types::String
+
+      # description [string, optional]
+      # Reason behind the refund.
       attribute :description, Types::String
+
+      # sources [array, optional]
+      # Information about money held for refunds: the amount to be held and the stores getting the refunds.
+      # Specified if you use the YooMoney solution for marketplaces
+      attribute? :sources, Types::Array.of(Entity::Source)
     end
   end
 end
diff --git a/lib/yookassa/entity/source.rb b/lib/yookassa/entity/source.rb
new file mode 100644
index 0000000..99c36a4
--- /dev/null
+++ b/lib/yookassa/entity/source.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require_relative "./types"
+require_relative "./amount"
+
+module Yookassa
+  module Entity
+    class Source < Dry::Struct
+      # account_id [string, required]
+      # ID of the store in favor of which you're accepting the receipt. Provided by YooMoney, displayed in the Sellers section
+      # of your Merchant Profile (shopId column).
+      attribute :account_id, Types::String
+
+      # amount [object, required]
+      # Refund amount
+      attribute :amount, Entity::Amount
+
+      # platform_fee_amount [object, optional]
+      # Commission for sold products or services charged in your favor.
+      attribute? :platform_fee_amount, Entity::Amount
+    end
+  end
+end