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-rw-r--r--doc/src/sgml/backup.sgml3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/src/sgml/backup.sgml b/doc/src/sgml/backup.sgml
index c5557d5444e..8c9186d277f 100644
--- a/doc/src/sgml/backup.sgml
+++ b/doc/src/sgml/backup.sgml
@@ -913,7 +913,8 @@ SELECT * FROM pg_stop_backup(false, true);
<filename>backup_label</filename> in the root directory of the backup. The
third field should be written to a file named
<filename>tablespace_map</filename> unless the field is empty. These files are
- vital to the backup working, and must be written without modification.
+ vital to the backup working and must be written byte for byte without
+ modification, which may require opening the file in binary mode.
</para>
</listitem>
<listitem>