bpo-38623: Add note about site module (site-packages) (GH-16974)

diff --git a/Doc/tutorial/modules.rst b/Doc/tutorial/modules.rst
index a495c50cbde880456a8cf21bac9f0eefd515a39d..f1d4957e37eb11a503c8d5e2e15ab5720ff63c05 100644 (file)
--- a/Doc/tutorial/modules.rst
+++ b/Doc/tutorial/modules.rst
@@ -191,7 +191,8 @@ named :file:`spam.py` in a list of directories given by the variable
   file is specified).
 * :envvar:`PYTHONPATH` (a list of directory names, with the same syntax as the
   shell variable :envvar:`PATH`).
-* The installation-dependent default.
+* The installation-dependent default (by convention including a
+  ``site-packages`` directory, handled by the :mod:`site` module).
 
 .. note::
    On file systems which support symlinks, the directory containing the input