1 files changed, 2 insertions, 0 deletions
diff --git a/index.js b/index.js
index 980c6b4..895656d 100644
--- a/index.js
+++ b/index.js
@@ -21,6 +21,8 @@ const interpret = tree => {
     return D.negative(interpret(tree.value))
   case 'bonusAdd':
     return D.bonusAdd(interpret(tree.left), interpret(tree.right))
+  case 'bonusSubtract':
+    return D.bonusSubtract(interpret(tree.left), interpret(tree.right))
   }
 }