diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
index 4c027b23584bf..3ff33fab431c4 100644
--- a/library/core/src/slice/mod.rs
+++ b/library/core/src/slice/mod.rs
@@ -6680,6 +6680,8 @@ unsafe impl<'a, T> TrustedRandomAccess for RChunksExactMut<'a, T> {
 ///       them from other data. You can obtain a pointer that is usable as `data`
 ///       for zero-length slices using [`NonNull::dangling()`].
 ///
+/// * `data` must point to `len` consecutive properly initialized values of type `T`.
+///
 /// * The memory referenced by the returned slice must not be mutated for the duration
 ///   of lifetime `'a`, except inside an `UnsafeCell`.
 ///
@@ -6767,6 +6769,8 @@ pub unsafe fn from_raw_parts<'a, T>(data: *const T, len: usize) -> &'a [T] {
 ///       them from other data. You can obtain a pointer that is usable as `data`
 ///       for zero-length slices using [`NonNull::dangling()`].
 ///
+/// * `data` must point to `len` consecutive properly initialized values of type `T`.
+///
 /// * The memory referenced by the returned slice must not be accessed through any other pointer
 ///   (not derived from the return value) for the duration of lifetime `'a`.
 ///   Both read and write accesses are forbidden.