diff --git a/src/doc/style/features/let.md b/src/doc/style/features/let.md
index f13a84f6fee..6f423c6de8e 100644
--- a/src/doc/style/features/let.md
+++ b/src/doc/style/features/let.md
@@ -61,8 +61,8 @@ conditional expression.
 Prefer
 
 ```rust
-s.iter().map(|x| x * 2)
-        .collect::<Vec<_>>()
+let v = s.iter().map(|x| x * 2)
+                .collect::<Vec<_>>();
 ```
 
 over