@@ -204,11 +204,11 @@
 /*!
  * @brief Returns an arbitrary object in the set.
  *
  * @return An arbitrary object in the set
  */
-- (ObjectType)anyObject;
+- (nullable ObjectType)anyObject;
 
 /*!
  * @brief Checks whether the set contains an object equal to the specified
  *	  object.
  *