diff --git a/src/test/regress/pg_regress.c b/src/test/regress/pg_regress.c
index a1902fe..bb39fa7 100644
--- a/src/test/regress/pg_regress.c
+++ b/src/test/regress/pg_regress.c
@@ -1955,6 +1955,9 @@ help(void)
 	printf(_("Usage:\n  %s [OPTION]... [EXTRA-TEST]...\n"), progname);
 	printf(_("\n"));
 	printf(_("Options:\n"));
+	printf(_("  --bindir[=DIR]            look for binaries in DIR (PATH is used if\n"));
+	printf(_("                            no argument is specified, %s\n"), PGBINDIR);
+	printf(_("                            is used if this option is not given.)\n"));
 	printf(_("  --config-auth=DATADIR     update authentication settings for DATADIR\n"));
 	printf(_("  --create-role=ROLE        create the specified role before testing\n"));
 	printf(_("  --dbname=DB               use database DB (default \"regression\")\n"));