@@ -208,11 +208,11 @@
 /*!
  * @brief Returns the superclass of the object.
  *
  * @return The superclass of the object
  */
-- (Class)superclass;
+- (nullable Class)superclass;
 
 /*!
  * @brief Returns a boolean whether the object of the specified kind.
  *
  * @param class_ The class whose kind is checked
@@ -505,11 +505,11 @@
 /*!
  * @brief Returns the superclass of the class.
  *
  * @return The superclass of the class
  */
-+ (Class)superclass;
++ (nullable Class)superclass;
 
 /*!
  * @brief Checks whether instances of the class respond to a given selector.
  *
  * @param selector The selector which should be checked for respondence