diff --git a/doc/src/sgml/backup-manifest.sgml b/doc/src/sgml/backup-manifest.sgml
index 376aff0d6d..b9634f2706 100644
--- a/doc/src/sgml/backup-manifest.sgml
+++ b/doc/src/sgml/backup-manifest.sgml
@@ -3,6 +3,10 @@
 <chapter id="backup-manifest-format">
  <title>Backup Manifest Format</title>
 
+  <indexterm>
+   <primary>Backup Manifest</primary>
+  </indexterm>
+
   <para>
    The backup manifest generated by <xref linkend="app-pgbasebackup" /> is
    primarily intended to permit the backup to be verified using