@@ -57,6 +57,11 @@
  * \brief Creates a union of the receiver and the specified set.
  *
  * \param set The set to create the union with
  */
 - (void)unionSet: (OFSet*)set;
+
+/**
+ * \brief Converts the mutable set to an immutable set.
+ */
+- (void)makeImmutable;
 @end