diff --git a/README.md b/README.md
index 0c22d1c..5f1fd07 100644
--- a/README.md
+++ b/README.md
@@ -182,6 +182,8 @@ No modules.
 | <a name="input_vpc"></a> [vpc](#input\_vpc) | VPC ID | `string` | `""` | no |
 | <a name="input_create_default_sg"></a> [create_default_sg](#input\_create_default_sg) | Creates default security group if value is true | `bool` | `true` | no |
 | <a name="input_zone_id"></a> [zone\_id](#input\_zone\_id) | Route 53 Zone id. | `string` | `""` | no |
+| <a name="input_auto_software_update_enabled"></a> [auto\_software\_update\_enabled](#input\_auto\_software\_update\_enabled) | Whether automatic service software updates are enabled for the domain. Defaults to false. | `bool` | `false` | no |
+
 
 ## Outputs
 
diff --git a/main.tf b/main.tf
index 5ab2a22..581fcd1 100644
--- a/main.tf
+++ b/main.tf
@@ -97,6 +97,10 @@ resource "aws_opensearch_domain" "opensearch" {
     }
   }
 
+  software_update_options {
+    auto_software_update_enabled = var.auto_software_update_enabled
+  }
+
   cluster_config {
     instance_type                 = var.instance_type
     dedicated_master_enabled      = try(var.cluster_config["dedicated_master_enabled"], false)
diff --git a/variables.tf b/variables.tf
index 21a034a..422dafb 100644
--- a/variables.tf
+++ b/variables.tf
@@ -301,3 +301,10 @@ variable "off_peak_window_start_time" {
   description = "Time for the 10h update window to begin. If you don't specify a window start time, AWS will default it to 10:00 P.M. local time."
   default     = null
 }
+
+variable "auto_software_update_enabled" {
+  type = bool
+
+  description = "Whether automatic service software updates are enabled for the domain. Defaults to false."
+  default     = false
+}