@@ -49,17 +49,19 @@
 
 /**
  * @brief Adds the specified object to the set.
  *
  * @param object The object to add to the set
+ * @throw OFInvalidArgumentException The specified object was `nil`
  */
 - (void)addObject: (ObjectType)object;
 
 /**
  * @brief Removes the specified object from the set.
  *
  * @param object The object to remove from the set
+ * @throw OFInvalidArgumentException The specified object was `nil`
  */
 - (void)removeObject: (ObjectType)object;
 
 /**
  * @brief Removes all objects from the receiver which are in the specified set.