diff --git a/src/main/java/org/thoughtworks/linesh/multicurrencymoney/Money.java b/src/main/java/org/thoughtworks/linesh/multicurrencymoney/Money.java
index d487838..68379bc 100644
--- a/src/main/java/org/thoughtworks/linesh/multicurrencymoney/Money.java
+++ b/src/main/java/org/thoughtworks/linesh/multicurrencymoney/Money.java
@@ -40,7 +40,6 @@ public Money times(int multiplier) {
         return new Money(this.amount * multiplier, currency);
     }
 
-
     @Override
     public Expression plus(Money addend) {
         return new Sum(this, addend);
diff --git a/src/main/java/org/thoughtworks/linesh/multicurrencymoney/Sum.java b/src/main/java/org/thoughtworks/linesh/multicurrencymoney/Sum.java
index a26cd83..9660435 100644
--- a/src/main/java/org/thoughtworks/linesh/multicurrencymoney/Sum.java
+++ b/src/main/java/org/thoughtworks/linesh/multicurrencymoney/Sum.java
@@ -1,8 +1,8 @@
 package org.thoughtworks.linesh.multicurrencymoney;
 
 public class Sum implements Expression {
-    public Money augend;
-    public Money addend;
+    private Money augend;
+    private Money addend;
 
     public Sum(Money augend, Money addend) {
         this.augend = augend;
@@ -13,4 +13,12 @@ public Sum(Money augend, Money addend) {
     public Expression plus(Money money) {
         return null;
     }
+
+    public Money getAugend() {
+        return augend;
+    }
+
+    public Money getAddend() {
+        return addend;
+    }
 }
diff --git a/src/test/java/org/thoughtworks/linesh/multicurrencymoney/MoneyTest.java b/src/test/java/org/thoughtworks/linesh/multicurrencymoney/MoneyTest.java
index 9589d25..682e67c 100644
--- a/src/test/java/org/thoughtworks/linesh/multicurrencymoney/MoneyTest.java
+++ b/src/test/java/org/thoughtworks/linesh/multicurrencymoney/MoneyTest.java
@@ -64,8 +64,8 @@ void should_test_our_assumptions_here() {
             Expression result = fiftyDollars.plus(fiftyDollars);
             Sum sum = (Sum) result;
             
-            assertEquals(fiftyDollars, sum.augend);
-            assertEquals(fiftyDollars, sum.addend);
+            assertEquals(fiftyDollars, sum.getAugend());
+            assertEquals(fiftyDollars, sum.getAddend());
         }
     }
 }
\ No newline at end of file