diff --git a/Kotlin/src/main/kotlin/com/gildedrose/GildedRose.kt b/Kotlin/src/main/kotlin/com/gildedrose/GildedRose.kt
index 7ede7cee..33f752fd 100644
--- a/Kotlin/src/main/kotlin/com/gildedrose/GildedRose.kt
+++ b/Kotlin/src/main/kotlin/com/gildedrose/GildedRose.kt
@@ -1,6 +1,6 @@
 package com.gildedrose
 
-class GildedRose(var items: List<Item>) {
+class GildedRose(val items: List<Item>) {
 
     fun updateQuality() {
         for (i in items.indices) {
diff --git a/Kotlin/src/main/kotlin/com/gildedrose/Item.kt b/Kotlin/src/main/kotlin/com/gildedrose/Item.kt
index eaf62a40..cdf09407 100644
--- a/Kotlin/src/main/kotlin/com/gildedrose/Item.kt
+++ b/Kotlin/src/main/kotlin/com/gildedrose/Item.kt
@@ -1,7 +1,9 @@
 package com.gildedrose
 
-open class Item(var name: String, var sellIn: Int, var quality: Int) {
-    override fun toString(): String {
-        return this.name + ", " + this.sellIn + ", " + this.quality
-    }
+open class Item(
+    var name: String,
+    var sellIn: Int,
+    var quality: Int,
+) {
+    override fun toString(): String = "$name, $sellIn, $quality"
 }
\ No newline at end of file