diff --git a/NEWS.adoc b/NEWS.adoc
index 410ad702ee..3d73a567e5 100644
--- a/NEWS.adoc
+++ b/NEWS.adoc
@@ -522,6 +522,11 @@ relocated into new `shutdown.default` INSTCMD definitions. [#2670]
    module in the build or execution environment (deprecated in Python 3.11,
    removed since Python 3.13). [#2183]
 
+ - the PyPI distribution of the `PyNUTClient` module tarball should now use a
+   lower-cased file name (and immediate versioned directory name inside) to
+   match the requirements of link:https://peps.python.org/pep-0625/[PEP-0625].
+   The Python module name (and its directory) should remain camel-cased. [#2773]
+
  - enabled installation of built single-file PDF and HTML (including man page
    renditions) under the configured `docdir`. It seems previously they were
    only built (if requested) but not installed via `make`, unlike the common
diff --git a/UPGRADING.adoc b/UPGRADING.adoc
index dfcfaca94a..254e29c178 100644
--- a/UPGRADING.adoc
+++ b/UPGRADING.adoc
@@ -57,6 +57,13 @@ Changes from 2.8.2 to 2.8.3
   depending on `target_cpu` of the build. If you had any scripts relying
   on the older pattern, they may have to be updated.
 
+- the PyPI distribution of the `PyNUTClient` module tarball should now use a
+  lower-cased file name (and immediate versioned directory name inside) to
+  match the requirements of link:https://peps.python.org/pep-0625/[PEP-0625].
+  The Python module name (and its directory) should remain camel-cased.
+  OS distribution package recipes that deliver the module separately (e.g.
+  as part of Python ecosystem rather than NUT) may have to adjust. [#2773]
+
 - Updated man page generation with `configure` script options to specify that
   manual sections on the target platform differ from (Linux-based) defaults
   hard-coded into page sources; this should allow to simplify NUT packaging
diff --git a/scripts/python/module/Makefile.am b/scripts/python/module/Makefile.am
index c9fc4a61e0..dde6fbae24 100644
--- a/scripts/python/module/Makefile.am
+++ b/scripts/python/module/Makefile.am
@@ -4,6 +4,10 @@
 # Note: this Makefile is focused on PyPI publication
 # The usual autotools stuff including clean-up is in parent dir
 # (to allow easier mixing of the module and app, if/when desired)
+#
+# NOTE: Due to PEP-0625, the versioned tarball and directory names
+# must be normalized to lower-case, as achieved by setup.py(.in).
+# The module name remains camel-cased as it always was.
 
 # Non-maintainers can at most generate the source layout for python setuptools
 # (having only shell scripting as a prerequisite suffices for that)
diff --git a/scripts/python/module/README.adoc b/scripts/python/module/README.adoc
index 18b1d84ddd..613de9007f 100644
--- a/scripts/python/module/README.adoc
+++ b/scripts/python/module/README.adoc
@@ -25,6 +25,8 @@ of the original project, allowing to develop other classes nearby later.
 It is published to PyPI repository as
 link:https://pypi.org/project/PyNUTClient/[PyNUTClient]
 and so should be installable with `pip` tooling.
+Note that the file name of the distribution tarball is lower-cased per
+PEP-0625 requirements, while the module name is camel-cased historically.
 
 Currently the module is regularly tested to work with Python interpreter
 versions 2.7, 3.4, 3.5 and 3.7.
diff --git a/scripts/python/module/setup.py.in b/scripts/python/module/setup.py.in
index c6276fd2f2..5f7c20ec25 100644
--- a/scripts/python/module/setup.py.in
+++ b/scripts/python/module/setup.py.in
@@ -15,7 +15,7 @@ with codecs.open(os.path.join(here, "README.txt"), encoding="utf-8") as fh:
     long_description = "\n" + fh.read()
 
 setup(
-    name =	"PyNUTClient",
+    name =	"pynutclient",	### "PyNUTClient" lower-cased due to PEP-0625
     version =	'@NUT_SOURCE_GITREV_NUMERIC@',
     author =	"The Network UPS Tools project",
     license_files =	('LICENSE-GPL3',),