diff --git a/Algo/Courses/Chapter 7 - High Order (exercises).md b/Algo/Courses/Chapter 7 - High Order (exercises).md
index cf9d413..3f86f46 100644
--- a/Algo/Courses/Chapter 7 - High Order (exercises).md	
+++ b/Algo/Courses/Chapter 7 - High Order (exercises).md	
@@ -34,4 +34,6 @@ val map : ('a -> 'b) -> 'a list -> 'b list = <fun>
 
 ## Ex 2.2
 ```
-# let rec for_app
+# let rec for_all p = function
+	| [] -> true
+	| e::t -> if p(e) then for_all p t else false;;