diff --git a/src/bin/gs_guc/cluster_guc.conf b/src/bin/gs_guc/cluster_guc.conf
index 87ebb5d0f..f37fc3102 100755
--- a/src/bin/gs_guc/cluster_guc.conf
+++ b/src/bin/gs_guc/cluster_guc.conf
@@ -318,6 +318,7 @@ ignore_system_indexes|bool|0,0|NULL|When ignore_system_indexes set to on, it is
 sql_ignore_strategy|string|0,0|NULL|NULL|
 parctl_min_cost|int|-1,2147483647|NULL|NULL|
 io_control_unit|int|1000,1000000|NULL|NULL|
+io_limits|int|0,1073741823|NULL|NULL|
 gin_pending_list_limit|int|64,2147483647|kB|NULL|
 intervalstyle|enum|postgres,postgres_verbose,sql_standard,iso_8601,a|NULL|NULL|
 join_collapse_limit|int|1,2147483647|NULL|NULL|