diff --git a/library/core/src/mem/mod.rs b/library/core/src/mem/mod.rs
index 005f8749e01e6..0d33fea75f407 100644
--- a/library/core/src/mem/mod.rs
+++ b/library/core/src/mem/mod.rs
@@ -383,7 +383,7 @@ pub const unsafe fn size_of_val_raw<T: ?Sized>(val: *const T) -> usize {
     unsafe { intrinsics::size_of_val(val) }
 }
 
-/// Returns the [ABI]-required minimum alignment of a type.
+/// Returns the [ABI]-required minimum alignment of a type in bytes.
 ///
 /// Every reference to a value of the type `T` must be a multiple of this number.
 ///
@@ -407,7 +407,8 @@ pub fn min_align_of<T>() -> usize {
     intrinsics::min_align_of::<T>()
 }
 
-/// Returns the [ABI]-required minimum alignment of the type of the value that `val` points to.
+/// Returns the [ABI]-required minimum alignment of the type of the value that `val` points to in
+/// bytes.
 ///
 /// Every reference to a value of the type `T` must be a multiple of this number.
 ///
@@ -430,7 +431,7 @@ pub fn min_align_of_val<T: ?Sized>(val: &T) -> usize {
     unsafe { intrinsics::min_align_of_val(val) }
 }
 
-/// Returns the [ABI]-required minimum alignment of a type.
+/// Returns the [ABI]-required minimum alignment of a type in bytes.
 ///
 /// Every reference to a value of the type `T` must be a multiple of this number.
 ///
@@ -454,7 +455,8 @@ pub const fn align_of<T>() -> usize {
     intrinsics::min_align_of::<T>()
 }
 
-/// Returns the [ABI]-required minimum alignment of the type of the value that `val` points to.
+/// Returns the [ABI]-required minimum alignment of the type of the value that `val` points to in
+/// bytes.
 ///
 /// Every reference to a value of the type `T` must be a multiple of this number.
 ///
@@ -477,7 +479,8 @@ pub const fn align_of_val<T: ?Sized>(val: &T) -> usize {
     unsafe { intrinsics::min_align_of_val(val) }
 }
 
-/// Returns the [ABI]-required minimum alignment of the type of the value that `val` points to.
+/// Returns the [ABI]-required minimum alignment of the type of the value that `val` points to in
+/// bytes.
 ///
 /// Every reference to a value of the type `T` must be a multiple of this number.
 ///