diff --git a/app/models/coin_change.rb b/app/models/coin_change.rb
index 9722a133..f5e066fb 100644
--- a/app/models/coin_change.rb
+++ b/app/models/coin_change.rb
@@ -1,2 +1,5 @@
 class CoinChange < ApplicationRecord
+  belongs_to :to_wallet, class_name: 'Wallet'
+  belongs_to :from_wallet, class_name: 'Wallet'
+  validates :amount, presence: true
 end