diff --git a/prelude/functions.v b/prelude/functions.v
index 1ae5080e7b26a2b24c0544cf33d9d6e47fda6afc..935d1b448b9dcbd9c1b62f790e57004b341c2e35 100644
--- a/prelude/functions.v
+++ b/prelude/functions.v
@@ -8,7 +8,7 @@ Section definitions.
     λ (g : T → T) a f b, if decide (a = b) then g (f a) else f b.
 End definitions.
 
-(* For now, we only have the properties here that do not need a notion
+(* TODO: For now, we only have the properties here that do not need a notion
    of equality of functions. *)
 
 Section functions.