diff --git a/README.md b/README.md
index 423ebac..02c0200 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,7 @@ No modules.
 | <a name="input_helm_repository"></a> [helm\_repository](#input\_helm\_repository) | Repository URL for the Materialize operator Helm chart. Leave empty if using local chart. | `string` | `"https://materializeinc.github.io/materialize/"` | no |
 | <a name="input_helm_values"></a> [helm\_values](#input\_helm\_values) | Values to pass to the Helm chart | `any` | n/a | yes |
 | <a name="input_install_metrics_server"></a> [install\_metrics\_server](#input\_install\_metrics\_server) | Whether to install the metrics-server | `bool` | `true` | no |
-| <a name="input_instances"></a> [instances](#input\_instances) | Configuration for Materialize instances | <pre>list(object({<br/>    name                    = string<br/>    namespace               = optional(string)<br/>    create_database         = optional(bool, true)<br/>    database_name           = string<br/>    metadata_backend_url    = string<br/>    persist_backend_url     = string<br/>    environmentd_version    = optional(string, "v0.130.8")<br/>    cpu_request             = optional(string, "1")<br/>    memory_request          = optional(string, "1Gi")<br/>    memory_limit            = optional(string, "1Gi")<br/>    in_place_rollout        = optional(bool, true)<br/>    request_rollout         = optional(string, "00000000-0000-0000-0000-000000000001")<br/>    force_rollout           = optional(string, "00000000-0000-0000-0000-000000000001")<br/>    balancer_memory_request = optional(string, "256Mi")<br/>    balancer_memory_limit   = optional(string, "256Mi")<br/>    balancer_cpu_request    = optional(string, "100m")<br/>  }))</pre> | `[]` | no |
+| <a name="input_instances"></a> [instances](#input\_instances) | Configuration for Materialize instances | <pre>list(object({<br/>    name                    = string<br/>    namespace               = optional(string)<br/>    create_database         = optional(bool, true)<br/>    database_name           = string<br/>    metadata_backend_url    = string<br/>    persist_backend_url     = string<br/>    license_key             = optional(string)<br/>    environmentd_version    = optional(string, "v0.130.8")<br/>    cpu_request             = optional(string, "1")<br/>    memory_request          = optional(string, "1Gi")<br/>    memory_limit            = optional(string, "1Gi")<br/>    in_place_rollout        = optional(bool, true)<br/>    request_rollout         = optional(string, "00000000-0000-0000-0000-000000000001")<br/>    force_rollout           = optional(string, "00000000-0000-0000-0000-000000000001")<br/>    balancer_memory_request = optional(string, "256Mi")<br/>    balancer_memory_limit   = optional(string, "256Mi")<br/>    balancer_cpu_request    = optional(string, "100m")<br/>  }))</pre> | `[]` | no |
 | <a name="input_metrics_server_version"></a> [metrics\_server\_version](#input\_metrics\_server\_version) | Version of metrics-server to install | `string` | `"3.12.2"` | no |
 | <a name="input_monitoring_namespace"></a> [monitoring\_namespace](#input\_monitoring\_namespace) | Namespace for monitoring resources | `string` | `"monitoring"` | no |
 | <a name="input_namespace"></a> [namespace](#input\_namespace) | Namespace prefix for all resources | `string` | n/a | yes |
diff --git a/main.tf b/main.tf
index 7356e50..4480609 100644
--- a/main.tf
+++ b/main.tf
@@ -49,6 +49,7 @@ resource "kubernetes_secret" "materialize_backends" {
   data = {
     metadata_backend_url = each.value.metadata_backend_url
     persist_backend_url  = each.value.persist_backend_url
+    license_key          = each.value.license_key == null ? "" : each.value.license_key
   }
 
   depends_on = [
diff --git a/variables.tf b/variables.tf
index b672ad7..708f0e1 100644
--- a/variables.tf
+++ b/variables.tf
@@ -71,6 +71,7 @@ variable "instances" {
     database_name           = string
     metadata_backend_url    = string
     persist_backend_url     = string
+    license_key             = optional(string)
     environmentd_version    = optional(string, "v0.130.8")
     cpu_request             = optional(string, "1")
     memory_request          = optional(string, "1Gi")