1 files changed, 2 insertions, 0 deletions
diff --git a/src/libcore/benches/ascii.rs b/src/libcore/benches/ascii.rs
index a337c467131..e921dd1ba06 100644
--- a/src/libcore/benches/ascii.rs
+++ b/src/libcore/benches/ascii.rs
@@ -118,6 +118,7 @@ benches! {
     }
 
     fn case07_fake_simd_u32(bytes: &mut [u8]) {
+        // SAFETY: transmuting a sequence of `u8` to `u32` is always fine
         let (before, aligned, after) = unsafe {
             bytes.align_to_mut::<u32>()
         };
@@ -142,6 +143,7 @@ benches! {
     }
 
     fn case08_fake_simd_u64(bytes: &mut [u8]) {
+        // SAFETY: transmuting a sequence of `u8` to `u64` is always fine
         let (before, aligned, after) = unsafe {
             bytes.align_to_mut::<u64>()
         };