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-rw-r--r--doc/src/sgml/pgupgrade.sgml5
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/src/sgml/pgupgrade.sgml b/doc/src/sgml/pgupgrade.sgml
index 301222c55d2..998cb2fc9a5 100644
--- a/doc/src/sgml/pgupgrade.sgml
+++ b/doc/src/sgml/pgupgrade.sgml
@@ -529,7 +529,10 @@ psql --username postgres --file script.sql postgres
<para>
A Log-Shipping Standby Server (<xref linkend="warm-standby">) cannot
be upgraded because the server must allow writes. The simplest way
- is to upgrade the primary and use rsync to rebuild the standbys.
+ is to upgrade the primary and use <command>rsync</> to rebuild the
+ standbys. You can run <command>rsync</> while the primary is down,
+ or as part of a base backup (<xref linkend="backup-base-backup">)
+ which overwrites the old standby cluster.
</para>
<para>