diff --git a/library/core/src/ptr/mut_ptr.rs b/library/core/src/ptr/mut_ptr.rs
index 8976154c61db9..11e0a83bd7ec0 100644
--- a/library/core/src/ptr/mut_ptr.rs
+++ b/library/core/src/ptr/mut_ptr.rs
@@ -1742,7 +1742,7 @@ impl<T> *mut [T] {
     /// that is at least `mid * size_of::<T>()` bytes long. Not upholding these
     /// requirements is *[undefined behavior]* even if the resulting pointers are not used.
     ///
-    /// Since `len` being in-bounds it is not a safety invariant of `*mut [T]` the
+    /// Since `len` being in-bounds is not a safety invariant of `*mut [T]` the
     /// safety requirements of this method are the same as for [`split_at_mut_unchecked`].
     /// The explicit bounds check is only as useful as `len` is correct.
     ///