Add link to PEP 394 regarding python2 vs python3 naming

diff --git a/doc/src/sgml/plpython.sgml b/doc/src/sgml/plpython.sgml
index bdb0d3377f837440f667f198cfb000abae9839d5..c15188c3e00f76dde67e34ae23d0523881b66b2e 100644 (file)
--- a/doc/src/sgml/plpython.sgml
+++ b/doc/src/sgml/plpython.sgml
@@ -90,6 +90,12 @@
     </listitem>
    </itemizedlist>
 
+   This scheme is analogous to the recommendations in <ulink
+   url="http://www.python.org/dev/peps/pep-0394/">PEP 394</ulink> regarding the
+   naming and transitioning of the <command>python</command> command.
+  </para>
+
+  <para>
    It depends on the build configuration or the installed packages
    whether PL/Python for Python 2 or Python 3 or both are available.
   </para>