diff --git a/Doc/library/tomllib.rst b/Doc/library/tomllib.rst
index 237881e5f14545..d3767798055da4 100644
--- a/Doc/library/tomllib.rst
+++ b/Doc/library/tomllib.rst
@@ -4,8 +4,6 @@
 .. module:: tomllib
    :synopsis: Parse TOML files.
 
-.. versionadded:: 3.11
-
 .. moduleauthor:: Taneli Hukkinen
 .. sectionauthor:: Taneli Hukkinen
 
@@ -17,8 +15,12 @@ This module provides an interface for parsing TOML 1.1.0 (Tom's Obvious Minimal
 Language, `https://toml.io <https://toml.io/en/>`_). This module does not
 support writing TOML.
 
+.. versionadded:: 3.11
+   The module was added with support for TOML 1.0.0.
+
 .. versionchanged:: next
-   Module updated to support TOML 1.1.0. Initially the module supported TOML 1.0.0.
+   Added TOML 1.1.0 support.
+   See the :ref:`What's New <whatsnew315-tomllib-1-1-0>` for details.
 
 
 .. seealso::
diff --git a/Doc/whatsnew/3.15.rst b/Doc/whatsnew/3.15.rst
index 8c92ac8e0319da..a2a98c7ff2106b 100644
--- a/Doc/whatsnew/3.15.rst
+++ b/Doc/whatsnew/3.15.rst
@@ -798,6 +798,56 @@ tkinter
   with outdated names.
   (Contributed by Serhiy Storchaka in :gh:`143754`)
 
+
+.. _whatsnew315-tomllib-1-1-0:
+
+tomllib
+-------
+
+* The :mod:`tomllib` module now supports TOML 1.1.0.
+  This is a backwards compatible update, meaning that all valid TOML 1.0.0
+  documents are parsed the same way.
+
+  The changes, according to the `official TOML changelog`_, are:
+
+  - Allow newlines and trailing commas in inline tables.
+
+    Previously an inline table had to be on a single line and couldn't end
+    with a trailing comma. This is now relaxed so that the following is valid:
+
+    .. syntax highlighting needs TOML 1.1.0 support in Pygments,
+       see https://github.com/pygments/pygments/issues/3026
+
+    .. code-block:: text
+
+       tbl = {
+          key      = "a string",
+          moar-tbl =  {
+             key = 1,
+          },
+       }
+
+  - Add ``\xHH`` notation to basic strings for codepoints under 255,
+    and the ``\e`` escape for the escape character:
+
+    .. code-block:: text
+
+       null = "null byte: \x00; letter a: \x61"
+       csi = "\e["
+
+  - Seconds in datetime and time values are now optional.
+    The following are now valid:
+
+    .. code-block:: text
+
+       dt = 2010-02-03 14:15
+       t  = 14:15
+
+  (Contributed by Taneli Hukkinen in :gh:`142956`.)
+
+.. _official TOML changelog: https://github.com/toml-lang/toml/blob/main/CHANGELOG.md
+
+
 types
 ------