diff --git a/docs/developer-setup.rst b/docs/developer-setup.rst
--- a/docs/developer-setup.rst
+++ b/docs/developer-setup.rst
@@ -22,7 +22,7 @@
 -----------------------------
 
 Software Heritage requires some dependencies that are usually packaged by your
-package manager. On Debian/Ubuntu-based distributions::
+package manager [1]. On Debian/Ubuntu-based distributions::
 
   sudo wget https://www.postgresql.org/media/keys/ACCC4CF8.asc -O /etc/apt/trusted.gpg.d/postgresql.asc
   echo "deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main" | sudo tee -a /etc/apt/sources.list.d/pgdg.list
@@ -34,6 +34,7 @@
                    postgresql-server-dev-all virtualenvwrapper git build-essential \
                    pkg-config myrepos lzip cassandra
 
+[1] python3.6 as minimum runtime requirements
 
 Cassandra and postgresql will be started by tests when they need it, so you
 don't need them started globally (this will save you some RAM)::
@@ -170,8 +171,8 @@
 
 
     ============================= warnings summary =============================
-    .tox/py3/lib/python3.5/site-packages/psycopg2/__init__.py:144
-      ~/swh-environment/swh-loader-git/.tox/py3/lib/python3.5/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>.
+    .tox/py3/lib/python3/site-packages/psycopg2/__init__.py:144
+      ~/swh-environment/swh-loader-git/.tox/py3/lib/python3/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>.
         """)
 
     -- Docs: https://docs.pytest.org/en/latest/warnings.html