diff --git a/koans/about-asserts.clj b/koans/about-asserts.clj
index b6272cf..718af9f 100644
--- a/koans/about-asserts.clj
+++ b/koans/about-asserts.clj
@@ -1,3 +1,5 @@
+(def __ nil)
+
 (defn #^{:zen "We shall contemplate truth by testing reality, via asserts."}
   test-truth
   []
@@ -9,3 +11,8 @@
   (let [expected-value 0
         actual-value (+ 1 1)]
     (assert (= expected-value actual-value))))
+
+(defn #^{:zen "Sometimes we will ask you to fill in the values"}
+  test-fill-in-values
+  []
+  (assert (= __ (+ 1 1))))
\ No newline at end of file
diff --git a/koans/path_to_enlightenment.clj b/koans/path_to_enlightenment.clj
index 3f221c1..bf0e338 100644
--- a/koans/path_to_enlightenment.clj
+++ b/koans/path_to_enlightenment.clj
@@ -13,4 +13,5 @@
 
 (meditate-on test-truth)
 (meditate-on test-assert-equality)
+(meditate-on test-fill-in-values)
 (println "You have achieved clojure zen. Go out into the universe and spread your newfound knowledge.")