Document how to install .dist-info/licenses per PEP 639

Author: befeleme

source/specifications/recording-installed-packages.rst

@@ -66,6 +66,11 @@ The ``METADATA`` file is mandatory.
 All other files may be omitted at the installing tool's discretion.
 Additional installer-specific files may be present.
 
+This ``.dist-info`` directory may contain the following directory, described in
+detail below:
+
+* ``licenses``: contains license files.
+
 .. note::
 
    The :ref:`binary-distribution-format` specification describes additional
@@ -219,6 +224,17 @@ of requirement (i.e. name plus version specifier).
 Its detailed specification is at :ref:`direct-url`.
 
 
+The licenses subdirectory
+=========================
+
+If the metadata version is 2.4 or greater and one or more License-File
+fields is specified, the ``.dist-info`` directory MUST contain a ``licenses``
+subdirectory which MUST contain the files listed in the License-File fields in
+the ``METADATA`` file at their respective paths relative to the licenses
+directory.
+Any files in this directory MUST be copied from wheels by the install tools.
+
+
 Intentionally preventing changes to installed packages
 ======================================================
 
@@ -259,3 +275,5 @@ History
   for the full definition.
 - September 2020: Various amendments and clarifications were approved through
   :pep:`627`.
+- November 2024: The .dist-info/licenses directory was specified through
+  :pep:`639`.