diff --git a/doc/src/sgml/backup.sgml b/doc/src/sgml/backup.sgml
index 6eaed1e..183fd37 100644
--- a/doc/src/sgml/backup.sgml
+++ b/doc/src/sgml/backup.sgml
@@ -636,7 +636,11 @@ test ! -f /mnt/server/archivedir/00000001000000A900000065 && cp pg_wal/0
     <productname>PostgreSQL</> will assume that the file has been
     successfully archived, and will remove or recycle it.  However, a nonzero
     status tells <productname>PostgreSQL</> that the file was not archived;
-    it will try again periodically until it succeeds.
+    it will try again periodically until it succeeds. Note that an exit
+    status of 128 or higher will cause the archiver to exit, resulting in a 
+    potentially misleading FATAL error in the server log. E.g., <command>rsync</>
+    tends to return an exit status of 255 when it is unable to resolve a 
+    hostname, which will cause the archiver process to exit (and restart).
    </para>
 
    <para>