1 files changed, 2 insertions, 0 deletions
diff --git a/index.js b/index.js
index 1851a77..9a4534b 100644
--- a/index.js
+++ b/index.js
@@ -27,6 +27,8 @@ const interpret = tree => {
     return D.add(interpret(tree.left), interpret(tree.right))
   case 'subtract':
     return D.subtract(interpret(tree.left), interpret(tree.right))
+  case 'multiply':
+    return D.multiply(interpret(tree.left), interpret(tree.right))
   case 'negative':
     return D.negative(interpret(tree.value))
   case 'bonusAdd':