diff --git a/doc/src/sgml/ref/pgupgrade.sgml b/doc/src/sgml/ref/pgupgrade.sgml
new file mode 100644
index fcc94ee..7f1c52a
*** a/doc/src/sgml/ref/pgupgrade.sgml
--- b/doc/src/sgml/ref/pgupgrade.sgml
*************** rsync --archive --delete --hard-links --
*** 504,509 ****
--- 504,511 ----
        </para>
  
        <para>
+        Unfortunately, <application>rsync</> also needlessly copies the
+        files associated with temporary and unlogged tables.
         If you have tablespaces, you will need to run a similar
         <application>rsync</> command for each tablespace directory.  If you
         have relocated <filename>pg_xlog</> outside the data directories,