*** a/src/bin/psql/tab-complete.c
--- b/src/bin/psql/tab-complete.c
***************
*** 1694,1699 **** psql_completion(const char *text, int start, int end)
--- 1694,1702 ----
  			"autovacuum_freeze_max_age",
  			"autovacuum_freeze_min_age",
  			"autovacuum_freeze_table_age",
+ 			"autovacuum_multixact_freeze_max_age",
+ 			"autovacuum_multixact_freeze_min_age",
+ 			"autovacuum_multixact_freeze_table_age",
  			"autovacuum_vacuum_cost_delay",
  			"autovacuum_vacuum_cost_limit",
  			"autovacuum_vacuum_scale_factor",
***************
*** 1703,1712 **** psql_completion(const char *text, int start, int end)
--- 1706,1719 ----
  			"toast.autovacuum_freeze_max_age",
  			"toast.autovacuum_freeze_min_age",
  			"toast.autovacuum_freeze_table_age",
+ 			"toast.autovacuum_multixact_freeze_max_age",
+ 			"toast.autovacuum_multixact_freeze_min_age",
+ 			"toast.autovacuum_multixact_freeze_table_age",
  			"toast.autovacuum_vacuum_cost_delay",
  			"toast.autovacuum_vacuum_cost_limit",
  			"toast.autovacuum_vacuum_scale_factor",
  			"toast.autovacuum_vacuum_threshold",
+ 			"user_catalog_table",
  			NULL
  		};