diff --git a/src/bin/pg_dump/pg_dumpall.c b/src/bin/pg_dump/pg_dumpall.c
index 0752c44896f..210aac1e040 100644
--- a/src/bin/pg_dump/pg_dumpall.c
+++ b/src/bin/pg_dump/pg_dumpall.c
@@ -595,7 +595,11 @@ main(int argc, char *argv[])
 	if (quote_all_identifiers)
 		executeCommand(conn, "SET quote_all_identifiers = true");
 
-	fprintf(OPF, "--\n-- PostgreSQL database cluster dump\n--\n\n");
+	if (archDumpFormat == archNull)
+		fprintf(OPF, "--\n-- PostgreSQL database cluster dump\n--\n\n");
+	else
+		fprintf(OPF, "--\n-- PostgreSQL global objects dump\n--\n\n");
+
 	if (verbose)
 		dumpTimestamp("Started on");
 
@@ -666,7 +670,11 @@ main(int argc, char *argv[])
 
 	if (verbose)
 		dumpTimestamp("Completed on");
-	fprintf(OPF, "--\n-- PostgreSQL database cluster dump complete\n--\n\n");
+
+	if (archDumpFormat == archNull)
+		fprintf(OPF, "--\n-- PostgreSQL database cluster dump complete\n--\n\n");
+	else
+		fprintf(OPF, "--\n-- PostgreSQL global objects dump complete\n--\n\n");
 
 	if (filename)
 	{
@@ -1619,7 +1627,7 @@ dumpDatabases(PGconn *conn, ArchiveFormat archDumpFormat)
 					   "WHERE datallowconn AND datconnlimit != -2 "
 					   "ORDER BY (datname <> 'template1'), datname");
 
-	if (PQntuples(res) > 0)
+	if (PQntuples(res) > 0 && archDumpFormat == archNull)
 		fprintf(OPF, "--\n-- Databases\n--\n\n");
 
 	/*
@@ -1677,7 +1685,8 @@ dumpDatabases(PGconn *conn, ArchiveFormat archDumpFormat)
 
 		pg_log_info("dumping database \"%s\"", dbname);
 
-		fprintf(OPF, "--\n-- Database \"%s\" dump\n--\n\n", dbname);
+		if (archDumpFormat == archNull)
+			fprintf(OPF, "--\n-- Database \"%s\" dump\n--\n\n", dbname);
 
 		/*
 		 * We assume that "template1" and "postgres" already exist in the