diff --git a/main.tf b/main.tf
index 4a0f686..1f94cad 100644
--- a/main.tf
+++ b/main.tf
@@ -189,6 +189,7 @@ resource "aws_rds_cluster_instance" "cluster_instance_0" {
   auto_minor_version_upgrade   = var.auto_minor_version_upgrade
   promotion_tier               = "0"
   performance_insights_enabled = var.performance_insights_enabled
+  ca_cert_identifier           = var.ca_cert_identifier
 
   tags = {
     envname = var.envname
@@ -215,6 +216,7 @@ resource "aws_rds_cluster_instance" "cluster_instance_n" {
   auto_minor_version_upgrade   = var.auto_minor_version_upgrade
   promotion_tier               = count.index + 1
   performance_insights_enabled = var.performance_insights_enabled
+  ca_cert_identifier           = var.ca_cert_identifier
 
   tags = {
     envname = var.envname
@@ -247,6 +249,7 @@ resource "aws_rds_cluster" "default" {
   deletion_protection             = var.deletion_protection
   allow_major_version_upgrade     = var.allow_major_version_upgrade
 
+
   tags = var.additional_tags
 }
 
diff --git a/variables.tf b/variables.tf
index a0b0358..6f74802 100644
--- a/variables.tf
+++ b/variables.tf
@@ -252,4 +252,10 @@ variable "additional_tags" {
   default     = {}
   description = "Additional db cluster tags"
   type        = map(string)
+}
+
+variable "ca_cert_identifier" {
+  type        = string
+  default     = ""
+  description = "The identifier of the CA certificate for the DB cluster"
 }
\ No newline at end of file