diff --git a/src/main/java/eu/ztsh/wymiana/exception/ExchangeFailedException.java b/src/main/java/eu/ztsh/wymiana/exception/ExchangeFailedException.java
index 481d330..b32bb5e 100644
--- a/src/main/java/eu/ztsh/wymiana/exception/ExchangeFailedException.java
+++ b/src/main/java/eu/ztsh/wymiana/exception/ExchangeFailedException.java
@@ -1,6 +1,6 @@
 package eu.ztsh.wymiana.exception;
 
-public class ExchangeFailedException extends RuntimeException{
+public class ExchangeFailedException extends RuntimeException {
 
     public ExchangeFailedException() {
         this("An exchange error has occurred");
diff --git a/src/main/java/eu/ztsh/wymiana/service/CurrencyService.java b/src/main/java/eu/ztsh/wymiana/service/CurrencyService.java
index f43d6b6..b00f761 100644
--- a/src/main/java/eu/ztsh/wymiana/service/CurrencyService.java
+++ b/src/main/java/eu/ztsh/wymiana/service/CurrencyService.java
@@ -53,7 +53,7 @@ public class CurrencyService {
     }
 
     private Currency create(String symbol) {
-        // TODO: check if supported
+        // TODO: check if supported - now limited to PLN <-> USD
         return new Currency(symbol.toUpperCase(), 0D);
     }
 
diff --git a/src/test/java/eu/ztsh/wymiana/util/UserMapperTest.java b/src/test/java/eu/ztsh/wymiana/util/UserMapperTest.java
index 0b4a7d9..dc1eeb8 100644
--- a/src/test/java/eu/ztsh/wymiana/util/UserMapperTest.java
+++ b/src/test/java/eu/ztsh/wymiana/util/UserMapperTest.java
@@ -15,28 +15,28 @@ class UserMapperTest {
     void entityToPojoTest() {
         var entity = EntityCreator.user().build();
         var expected = new User(
-                EntityCreator.Constants.NAME,
-                EntityCreator.Constants.SURNAME,
-                EntityCreator.Constants.PESEL,
-                Map.of("PLN", new Currency("PLN", EntityCreator.Constants.PLN))
+            EntityCreator.Constants.NAME,
+            EntityCreator.Constants.SURNAME,
+            EntityCreator.Constants.PESEL,
+            Map.of("PLN", new Currency("PLN", EntityCreator.Constants.PLN))
         );
         assertThat(UserMapper.entityToPojo(entity))
-                .usingRecursiveComparison()
-                .isEqualTo(expected);
+            .usingRecursiveComparison()
+            .isEqualTo(expected);
     }
 
     @Test
     void pojoToEntityTest() {
         var entity = new User(
-                EntityCreator.Constants.NAME,
-                EntityCreator.Constants.SURNAME,
-                EntityCreator.Constants.PESEL,
-                Map.of("PLN", new Currency("PLN", EntityCreator.Constants.PLN))
+            EntityCreator.Constants.NAME,
+            EntityCreator.Constants.SURNAME,
+            EntityCreator.Constants.PESEL,
+            Map.of("PLN", new Currency("PLN", EntityCreator.Constants.PLN))
         );
         var expected = EntityCreator.user().build();
         assertThat(UserMapper.pojoToEntity(entity))
-                .usingRecursiveComparison()
-                .isEqualTo(expected);
+            .usingRecursiveComparison()
+            .isEqualTo(expected);
     }
 
     @Test
@@ -44,8 +44,8 @@ class UserMapperTest {
         var request = EntityCreator.userRequest().build();
         var expected = EntityCreator.user().build();
         assertThat(UserMapper.requestToEntity(request))
-                .usingRecursiveComparison()
-                .isEqualTo(expected);
+            .usingRecursiveComparison()
+            .isEqualTo(expected);
     }
 
 }