diff --git a/docs/persistent-identifiers.rst b/docs/persistent-identifiers.rst
--- a/docs/persistent-identifiers.rst
+++ b/docs/persistent-identifiers.rst
@@ -300,8 +300,8 @@
 `swh identify <https://docs.softwareheritage.org/devel/swh-model/cli.html>`_
 tool, available from the `swh.model <https://pypi.org/project/swh.model/>`_
 Python package under the GPL license. This package can be installed via the ``pip``
-package manager with the one liner ``pip install swh.model`` on any machine with
-Python and ``pip`` installed (on a Debian or Ubuntu system a simple ``apt install python3 python3-pip``
+package manager with the one liner ``pip3 install swh.model`` on any machine with
+Python  (at least version 3.7) and ``pip`` installed (on a Debian or Ubuntu system a simple ``apt install python3 python3-pip``
 will suffice, see `the general instructions <https://packaging.python.org/tutorials/installing-packages/>`_ for other platforms).
 
 SWHIDs are also automatically computed by Software Heritage for all archived