diff --git a/caesar/caesar.spec.js b/caesar/caesar.spec.js
index 5432e6e..3c98420 100644
--- a/caesar/caesar.spec.js
+++ b/caesar/caesar.spec.js
@@ -19,4 +19,7 @@ describe('caesar', function() {
   xit('works with large shift factors', function() {
     expect(caesar('Hello, World!', 75)).toEqual('Ebiil, Tloia!');
   });
+  xit('works with large negative shift factors', function() {
+    expect(caesar('Hello, World!', -29)).toEqual('Ebiil, Tloia!');
+  });
 });