#7475: add (un)transform method to bytes/bytearray and str, add back codecs that can be used with them from Python 2.
diff --git a/Doc/library/codecs.rst b/Doc/library/codecs.rst
index dcfc46f..5416d3b 100644
--- a/Doc/library/codecs.rst
+++ b/Doc/library/codecs.rst
@@ -1165,6 +1165,46 @@
| | | operand |
+--------------------+---------+---------------------------+
+The following codecs provide bytes-to-bytes mappings. They can be used with
+:meth:`bytes.transform` and :meth:`bytes.untransform`.
+
++--------------------+---------------------------+---------------------------+
+| Codec | Aliases | Purpose |
++====================+===========================+===========================+
+| base64_codec | base64, base-64 | Convert operand to MIME |
+| | | base64 |
++--------------------+---------------------------+---------------------------+
+| bz2_codec | bz2 | Compress the operand |
+| | | using bz2 |
++--------------------+---------------------------+---------------------------+
+| hex_codec | hex | Convert operand to |
+| | | hexadecimal |
+| | | representation, with two |
+| | | digits per byte |
++--------------------+---------------------------+---------------------------+
+| quopri_codec | quopri, quoted-printable, | Convert operand to MIME |
+| | quotedprintable | quoted printable |
++--------------------+---------------------------+---------------------------+
+| uu_codec | uu | Convert the operand using |
+| | | uuencode |
++--------------------+---------------------------+---------------------------+
+| zlib_codec | zip, zlib | Compress the operand |
+| | | using gzip |
++--------------------+---------------------------+---------------------------+
+
+The following codecs provide string-to-string mappings. They can be used with
+:meth:`str.transform` and :meth:`str.untransform`.
+
++--------------------+---------------------------+---------------------------+
+| Codec | Aliases | Purpose |
++====================+===========================+===========================+
+| rot_13 | rot13 | Returns the Caesar-cypher |
+| | | encryption of the operand |
++--------------------+---------------------------+---------------------------+
+
+.. versionadded:: 3.2
+ bytes-to-bytes and string-to-string codecs.
+
:mod:`encodings.idna` --- Internationalized Domain Names in Applications
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