diff --git a/golden/exec/factorial/source.scm b/golden/exec/factorial/source.scm
index 313b5ae..ccc9aad 100644
--- a/golden/exec/factorial/source.scm
+++ b/golden/exec/factorial/source.scm
@@ -2,4 +2,5 @@
                 (if (zero? n)
                     1
                     (* n (fac (- n 1)))))))
-  (fac 6))
+  ;; 20 is the greatest `n` for which n! ≤ maxBount @Int
+  (fac 20))