diff --git a/exercises/practice/knapsack/knapsack.moon b/exercises/practice/knapsack/knapsack.moon
index e69de29..f8c8824 100644
--- a/exercises/practice/knapsack/knapsack.moon
+++ b/exercises/practice/knapsack/knapsack.moon
@@ -0,0 +1,4 @@
+{
+  maximumValue: (maximumWeight, items) ->
+    error 'Implement me'
+}