diff --git a/src/koans/03_vectors.clj b/src/koans/03_vectors.clj
index 83e6ef0..c92187d 100644
--- a/src/koans/03_vectors.clj
+++ b/src/koans/03_vectors.clj
@@ -26,5 +26,8 @@
   "You can also slice a vector"
   (= __ (subvec [:peanut :butter :and :jelly] 1 3))
 
+  "You can find out if a value is in a vector"
+  (= __ (contains? [1 2 3] 4))
+
   "Equality with collections is in terms of values"
   (= (list 1 2 3) (vector 1 2 __)))