diff -r dd5e7aef4d5b Doc/library/site.rst
--- a/Doc/library/site.rst	Sun Apr 14 10:36:03 2013 +0200
+++ b/Doc/library/site.rst	Sun Apr 14 10:42:02 2013 +0200
@@ -31,6 +31,13 @@ Unix and Macintosh).  For each of the di
 if it refers to an existing directory, and if so, adds it to ``sys.path`` and
 also inspects the newly added path for configuration files.
 
+.. note::
+
+   Some Linux distributions (such as Debian/Ubuntu) change the default module
+   search path to be able to share Python modules between minor versions.  These
+   distributions should patch the docstring for the :mod:`site` module to
+   explain their changes, so please refer to ``help(site)`` on these platforms.
+
 A path configuration file is a file whose name has the form :file:`{name}.pth`
 and exists in one of the four directories mentioned above; its contents are
 additional items (one per line) to be added to ``sys.path``.  Non-existing items