diff --git a/doc/src/sgml/backup.sgml b/doc/src/sgml/backup.sgml
index 0e7c6e2051..cfffea3919 100644
--- a/doc/src/sgml/backup.sgml
+++ b/doc/src/sgml/backup.sgml
@@ -890,7 +890,10 @@ SELECT pg_start_backup('label', false, false);
 SELECT * FROM pg_stop_backup(false, true);
 </programlisting>
      This terminates the backup mode and performs an automatic switch to
-     the next WAL segment.  The reason for the switch is to arrange for
+     the next WAL segment when run on a primary.  On a standby you can call
+     <function>pg_switch_wal</function> on the primary to perform a manual
+     switch.
+     The reason for the switch is to arrange for
      the last WAL segment file written during the backup interval to be
      ready to archive.
     </para>
@@ -908,9 +911,12 @@ SELECT * FROM pg_stop_backup(false, true);
      Once the WAL segment files active during the backup are archived, you are
      done.  The file identified by <function>pg_stop_backup</>'s first return
      value is the last segment that is required to form a complete set of
-     backup files.  If <varname>archive_mode</> is enabled,
+     backup files.  On a primary, if <varname>archive_mode</> is enabled and the
+     <literal>wait_for_archive</> parameter is <literal>true</>,
      <function>pg_stop_backup</> does not return until the last segment has
      been archived.
+     On a standby, <varname>archive_mode</> must be <literal>always</> in order
+     for <function>pg_stop_backup</> to wait.
      Archiving of these files happens automatically since you have
      already configured <varname>archive_command</>. In most cases this
      happens quickly, but you are advised to monitor your archive
@@ -940,11 +946,12 @@ SELECT * FROM pg_stop_backup(false, true);
     </para>
    </sect3>
    <sect3 id="backup-lowlevel-base-backup-exclusive">
-    <title>Making an exclusive low level backup</title>
+    <title>Making an exclusive low level backup on a primary</title>
     <para>
      The process for an exclusive backup is mostly the same as for a
      non-exclusive one, but it differs in a few key steps. It does not allow
-     more than one concurrent backup to run, and there can be some issues on
+     more than one concurrent backup to run, must be run on a primary, and there
+     can be some issues on
      the server if it crashes during the backup. Prior to PostgreSQL 9.6, this
      was the only low-level method available, but it is now recommended that
      all users upgrade their scripts to use non-exclusive backups if possible.
@@ -1012,15 +1019,10 @@ SELECT pg_start_backup('label', true);
 <programlisting>
 SELECT pg_stop_backup();
 </programlisting>
-     This function, when called on a primary, terminates the backup mode and
+     This function terminates the backup mode and
      performs an automatic switch to the next WAL segment. The reason for the
      switch is to arrange for the last WAL segment written during the backup
-     interval to be ready to archive.  When called on a standby, this function
-     only terminates backup mode.  A subsequent WAL segment switch will be
-     needed in order to ensure that all WAL files needed to restore the backup
-     can be archived; if the primary does not have sufficient write activity
-     to trigger one, <function>pg_switch_wal</function> should be executed on
-     the primary.
+     interval to be ready to archive.
     </para>
    </listitem>
    <listitem>
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index b43ec30a4e..28eda97273 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -18606,7 +18606,8 @@ postgres=# select pg_start_backup('label_goes_here');
    </para>
 
    <para>
-    The function also creates a backup history file in the write-ahead log
+    When executed on a primary, the function also creates a backup history file
+    in the write-ahead log
     archive area. The history file includes the label given to
     <function>pg_start_backup</>, the starting and ending write-ahead log locations for
     the backup, and the starting and ending times of the backup.  The return