diff --git a/doc/contributing.texi b/doc/contributing.texi
index 4b1eed1cb1..17dd4ec7a9 100644
--- a/doc/contributing.texi
+++ b/doc/contributing.texi
@@ -786,6 +786,24 @@ for instance, the module python-dateutil is packaged under the names
 starts with @code{py} (e.g.@: @code{pytz}), we keep it and prefix it as
 described above.
 
+@quotation Note
+Instead of the default Python build system @var{python-build-system}
+(@pxref{Build Systems}), we are encouraging to try the ``experimental''
+@var{pyproject-build-system} exported by @code{guix build-system
+pyproject}.  It is a reimplementation of @var{python-build-system}
+designed around @file{pyproject.toml} and
+@url{https://peps.python.org/pep-0517/, PEP 517}, and it supports a
+variety of build backends and test frameworks.
+
+It is considered ``experimental'' in that the implementation details are
+not set in stone yet.  However, there should not be any breaking
+changes, so please report any failure for new Python packages (even
+those using @file{setup.py}).
+
+Eventually this @var{pyproject-build-system} will be deprecated and
+merged back into @var{python-build-system}, probably some time in 2024.
+@end quotation
+
 @subsubsection Specifying Dependencies
 @cindex inputs, for Python packages