@@ -36,18 +36,25 @@
  * @param capacity The initial capacity for the OFMutableSet
  * @return A new autoreleased OFMutableSet
  */
 + (instancetype)setWithCapacity: (size_t)capacity;
 
+/**
+ * @brief Initializes an already allocated OFMutableSet to be empty.
+ *
+ * @return An initialized OFMutableSet
+ */
+- (instancetype)init OF_DESIGNATED_INITIALIZER;
+
 /**
  * @brief Initializes an already allocated OFMutableSet with enough memory to
  *	  hold the specified number of objects.
  *
  * @param capacity The initial capacity for the OFMutableSet
  * @return An initialized OFMutableSet
  */
-- (instancetype)initWithCapacity: (size_t)capacity;
+- (instancetype)initWithCapacity: (size_t)capacity OF_DESIGNATED_INITIALIZER;
 
 /**
  * @brief Adds the specified object to the set.
  *
  * @param object The object to add to the set