diff --git a/src/generics/assoc_items/types.md b/src/generics/assoc_items/types.md
index a5bbbfe139..201e66e838 100644
--- a/src/generics/assoc_items/types.md
+++ b/src/generics/assoc_items/types.md
@@ -42,8 +42,8 @@ trait Contains {
     type B;
 
     fn contains(&self, _: &Self::A, _: &Self::B) -> bool;
-    fn first(&self) -> i32;
-    fn last(&self) -> i32;
+    fn first(&self) -> A;
+    fn last(&self) -> B;
 }
 
 impl Contains for Container {