diff --git a/src/Util.md b/src/Util.md
index 836a4cd..62d4a83 100644
--- a/src/Util.md
+++ b/src/Util.md
@@ -13,6 +13,19 @@ import Data.List.Lazy
 %default total
 ```
 
+## Functions
+
+### repeatN
+
+Recursively applies `f` to `seed` N times
+
+```idris
+export
+repeatN : (times : Nat) -> (f : a -> a) -> (seed : a) -> a
+repeatN 0 f seed = seed
+repeatN (S times') f seed = repeatN times' f (f seed)
+```
+
 ## Either
 
 <!-- idris