diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
index 32d8988f1492..c0eb000e8779 100644
--- a/library/core/src/slice/mod.rs
+++ b/library/core/src/slice/mod.rs
@@ -3536,7 +3536,7 @@ pub unsafe fn align_to_mut<U>(&mut self) -> (&mut [T], &mut [U], &mut [T]) {
     ///         suffix.iter().copied().sum(),
     ///     ]);
     ///     let sums = middle.iter().copied().fold(sums, f32x4::add);
-    ///     sums.horizontal_sum()
+    ///     sums.reduce_sum()
     /// }
     ///
     /// let numbers: Vec<f32> = (1..101).map(|x| x as _).collect();