diff --git a/libcxx/include/optional b/libcxx/include/optional
--- a/libcxx/include/optional
+++ b/libcxx/include/optional
@@ -393,9 +393,9 @@
     }
 };
 
-// optional<T&> is currently required ill-formed, however it may to be in the
-// future. For this reason it has already been implemented to ensure we can
-// make the change in an ABI compatible manner.
+// optional<T&> is currently required to be ill-formed. However it may
+// be allowed in the future. For this reason, it has already been implemented
+// to ensure we can make the change in an ABI-compatible manner.
 template <class _Tp>
 struct __optional_storage_base<_Tp, true>
 {