diff --git a/examples/expr.not b/examples/expr.not
index b9ad12e..089673e 100644
--- a/examples/expr.not
+++ b/examples/expr.not
@@ -1,3 +1,9 @@
+# pow = (n, p) {
+#     p == 0
+#         ?? 1
+#         !! n * pow(n, p - 1)
+# }
+
 kilo = pow(2, 10)
 mega = pow(2, 20)
 giga = pow(2, 30)