@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2008-2021 Jonathan Schleifer <js@nil.im>
+ * Copyright (c) 2008-2022 Jonathan Schleifer <js@nil.im>
  *
  * All rights reserved.
  *
  * This file is part of ObjFW. It may be distributed under the terms of the
  * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
@@ -37,11 +37,12 @@
  * @warning The pointer is only valid until the OFMutableData is changed!
  *
  * Modifying the returned array directly is allowed and will change the contents
  * of the data.
  */
-@property (readonly, nonatomic) void *mutableItems OF_RETURNS_INNER_POINTER;
+@property OF_NULLABLE_PROPERTY (readonly, nonatomic) void *mutableItems
+    OF_RETURNS_INNER_POINTER;
 
 /**
  * @brief The first item of the OFMutableData or `NULL`.
  */
 @property OF_NULLABLE_PROPERTY (readonly, nonatomic) void *mutableFirstItem