diff --git a/library/core/src/ptr/const_ptr.rs b/library/core/src/ptr/const_ptr.rs
index 75322066983..19953afb4fe 100644
--- a/library/core/src/ptr/const_ptr.rs
+++ b/library/core/src/ptr/const_ptr.rs
@@ -464,7 +464,7 @@ impl<T: ?Sized> *const T {
     ///
     /// [`guaranteed_ne`]: #method.guaranteed_ne
     ///
-    /// The return value may change depending on the compiler version and unsafe code might not
+    /// The return value may change depending on the compiler version and unsafe code must not
     /// rely on the result of this function for soundness. It is suggested to only use this function
     /// for performance optimizations where spurious `false` return values by this function do not
     /// affect the outcome, but just the performance.
@@ -495,7 +495,7 @@ impl<T: ?Sized> *const T {
     ///
     /// [`guaranteed_eq`]: #method.guaranteed_eq
     ///
-    /// The return value may change depending on the compiler version and unsafe code might not
+    /// The return value may change depending on the compiler version and unsafe code must not
     /// rely on the result of this function for soundness. It is suggested to only use this function
     /// for performance optimizations where spurious `false` return values by this function do not
     /// affect the outcome, but just the performance.