@@ -195,11 +195,11 @@
 /*!
  * @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
@@ -459,11 +459,11 @@
 /*!
  * @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
@@ -649,11 +649,11 @@
  *
  * @param size The size of the memory to allocate
  * @return A pointer to the allocated memory. May return NULL if the specified
  *	   size is 0.
  */
-- (void *)allocMemoryWithSize: (size_t)size;
+- (nullable void *)allocMemoryWithSize: (size_t)size;
 
 /*!
  * @brief Allocates memory for the specified number of items and stores it in
  *	  the object's memory pool.
  *
@@ -662,12 +662,12 @@
  * @param size The size of each item to allocate
  * @param count The number of items to allocate
  * @return A pointer to the allocated memory. May return NULL if the specified
  *	   size or count is 0.
  */
-- (void *)allocMemoryWithSize: (size_t)size
-			count: (size_t)count;
+- (nullable void *)allocMemoryWithSize: (size_t)size
+				 count: (size_t)count;
 
 /*!
  * @brief Resizes memory in the object's memory pool to the specified size.
  *
  * If the pointer is NULL, this is equivalent to allocating memory.