diff --git a/src/backend/main/main.c b/src/backend/main/main.c
index 5a964a0db67..f5da4260a13 100644
--- a/src/backend/main/main.c
+++ b/src/backend/main/main.c
@@ -351,7 +351,7 @@ help(const char *progname)
 	printf(_("  -?, --help         show this help, then exit\n"));
 
 	printf(_("\nDeveloper options:\n"));
-	printf(_("  -f s|i|n|m|h       forbid use of some plan types\n"));
+	printf(_("  -f s|i|o|b|t|n|m|h forbid use of some plan types\n"));
 	printf(_("  -n                 do not reinitialize shared memory after abnormal exit\n"));
 	printf(_("  -O                 allow system table structure changes\n"));
 	printf(_("  -P                 disable system indexes\n"));