diff --git a/deck-of-cards-kata/src/main/java/bnymellon/codekatas/deckofcards/custom/collections/AbstractMutableMultimap.java b/deck-of-cards-kata/src/main/java/bnymellon/codekatas/deckofcards/custom/collections/AbstractMutableMultimap.java
index 7575b8a..a88c737 100644
--- a/deck-of-cards-kata/src/main/java/bnymellon/codekatas/deckofcards/custom/collections/AbstractMutableMultimap.java
+++ b/deck-of-cards-kata/src/main/java/bnymellon/codekatas/deckofcards/custom/collections/AbstractMutableMultimap.java
@@ -187,4 +187,10 @@ public boolean equals(Object obj)
         }
         return false;
     }
+
+    @Override
+    public String toString()
+    {
+        return this.getBackingMap().toString();
+    }
 }