diff --git a/library/alloc/src/vec.rs b/library/alloc/src/vec.rs
index 2580c970713b0..f9ee2034f312c 100644
--- a/library/alloc/src/vec.rs
+++ b/library/alloc/src/vec.rs
@@ -174,7 +174,9 @@ use crate::raw_vec::RawVec;
 ///
 /// // ... and that's all!
 /// // you can also do it like this:
-/// let x : &[usize] = &v;
+/// let u: &[usize] = &v;
+/// // or like this:
+/// let u: &[_] = &v;
 /// ```
 ///
 /// In Rust, it's more common to pass slices as arguments rather than vectors