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diff --git a/ucw/doc/fastbuf.txt b/ucw/doc/fastbuf.txt
index df803a08..d94fffe9 100644
--- a/ucw/doc/fastbuf.txt
+++ b/ucw/doc/fastbuf.txt
@@ -1,12 +1,63 @@
 Fastbufs
 ========
 
-Fastbufs are stream and file abstractions. They work with normal
-files, network sockets, memory buffers or just any file descriptor. It
-should be easy to implement other types by providing functions to
-refill and read the buffer.
+A *fastbuf* is a stream (or file) abstraction optimized for both speed
+and flexibility.
 
-Apart from abstraction, they are very fast.
+Fastbufs can represent many different kinds of objects: regular files, network
+sockets, file descriptors in general, or various memory buffers. These objects
+are handled by different fastbuf *back-ends.*
+
+Once you have a fastbuf, you can access it by fuctions similar to those of
+`stdio.h`, or you can use a variety of fastbuf *front-ends* providing various
+formatted operations.
+
+Please keep in mind that fastbufs do not allow arbitrary mixing of reads and
+writes on the same stream. If you need to mix them, you have to call @bflush()
+inbetween and remember that the file position reported by @btell() points after
+the flushed buffer, which is not necessarily the same as after the data you've
+really read.
+
+.Back-ends:
+- <<fbparam,Files (parametrized)>>
+- <<fbfile,Regular files>>
+- <<fbtemp,Temporary files>>
+- <<fblim,File fragments>>
+- <<fbmem,In-memory streams>>
+- <<fbbuf,Buffers>>
+- <<fbgrow,Growing buffers>>
+- <<fbpool,Memory pools>>
+- <<fbatomic,Atomic files>>
+
+.Front-ends:
+- <<ffbasic,Basic functions>>
+
+.Other reading:
+- <<internal,Internal structure>>
+- <<bconfig,Configuring streams>>
+
+ucw/fastbuf.h
+-------------
 
-The main iclude file is +ucw/fastbuf.h+: +
 !!ucw/fastbuf.h
+
+ucw/fb-socket.h
+---------------
+
+Fastbufs on network sockets with timeouts.
+
+!!ucw/fb-socket.h
+
+ucw/ff-unicode.h
+----------------
+
+Reading and writing of unicode characters.
+
+Invalid codes are replaced by `UNI_REPLACEMENT` when reading.
+
+!!ucw/ff-unicode.h
+
+ucw/ff-binary.h
+---------------
+
+!!ucw/ff-binary.h