- * If used in some formatter, you'll probably have a large and deep structure
- * of nested fastbufs. Just before reading from the fbmulti, you may call
- * @fbmulti_flatten() to flatten the structure. After @fbmulti_flatten(), the
- * fbmulti is seeked to the beginning, flushed and ready to read the whole buffer.
- *
- * For performance reasons, use @fbmulti_flatten() only once, just before reading.
+ * After @fbmulti_remove, the state of the fbmulti is undefined. The only allowed
+ * operation is either another @fbmulti_remove or @bclose on the fbmulti.