diff --git a/terraform/README.md b/terraform/README.md
index c0c4b4953..607032d3c 100644
--- a/terraform/README.md
+++ b/terraform/README.md
@@ -139,7 +139,7 @@ Terraform module.
       # Enable optional alerting.
       module "en-alerting" {
         source  = "github.com/google/exposure-notifications-verification-server/terraform/alerting"
-          project = "example"
+          monitoring-host-project = "example"
 
           adminapi-host  = "adminapi.example.org"
           apiserver-host = "apiserver.example.org"
diff --git a/terraform/alerting/monitoring.tf b/terraform/alerting/monitoring.tf
index fefc9c88b..d621eee84 100644
--- a/terraform/alerting/monitoring.tf
+++ b/terraform/alerting/monitoring.tf
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 resource "google_monitoring_dashboard" "verification-server" {
-  project        = var.project
+  project        = var.monitoring-host-project
   dashboard_json = jsonencode(yamldecode(file("${path.module}/dashboards/verification-server.yaml")))
   depends_on = [
     null_resource.manual-step-to-enable-workspace
@@ -21,7 +21,7 @@ resource "google_monitoring_dashboard" "verification-server" {
 }
 
 resource "google_monitoring_dashboard" "e2e" {
-  project        = var.project
+  project        = var.monitoring-host-project
   dashboard_json = jsonencode(yamldecode(file("${path.module}/dashboards/e2e.yaml")))
   depends_on = [
     null_resource.manual-step-to-enable-workspace
@@ -29,7 +29,7 @@ resource "google_monitoring_dashboard" "e2e" {
 }
 
 resource "google_monitoring_alert_policy" "five_xx" {
-  project      = var.project
+  project      = var.monitoring-host-project
   display_name = "Elevated 5xx"
   combiner     = "OR"
   conditions {
@@ -75,7 +75,7 @@ EOT
 }
 
 resource "google_monitoring_alert_policy" "rate_limited_count" {
-  project      = var.project
+  project      = var.monitoring-host-project
   display_name = "ElevatedRateLimitedCount"
   combiner     = "OR"
   conditions {
@@ -111,7 +111,7 @@ client app, or a potential DoS attack.
 
 View the metric here
 
-https://console.cloud.google.com/monitoring/dashboards/custom/${basename(google_monitoring_dashboard.verification-server.id)}?project=${var.project}
+https://console.cloud.google.com/monitoring/dashboards/custom/${basename(google_monitoring_dashboard.verification-server.id)}?project=${var.monitoring-host-project}
 EOT
     mime_type = "text/markdown"
   }
diff --git a/terraform/alerting/notifications.tf b/terraform/alerting/notifications.tf
index 74f14cc78..b9bfbb1d9 100644
--- a/terraform/alerting/notifications.tf
+++ b/terraform/alerting/notifications.tf
@@ -1,6 +1,6 @@
 resource "google_monitoring_notification_channel" "email" {
   provider     = google-beta
-  project      = var.project
+  project      = var.monitoring-host-project
   display_name = "Email Notification Channel"
   type         = "email"
   labels = {
diff --git a/terraform/alerting/probers.tf b/terraform/alerting/probers.tf
index 34a177647..4e79add13 100644
--- a/terraform/alerting/probers.tf
+++ b/terraform/alerting/probers.tf
@@ -3,7 +3,7 @@ resource "google_monitoring_uptime_check_config" "https" {
 
   display_name = each.key
   timeout      = "3s"
-  project      = var.project
+  project      = var.monitoring-host-project
   period       = "60s"
 
   http_check {
@@ -16,7 +16,7 @@ resource "google_monitoring_uptime_check_config" "https" {
   monitored_resource {
     type = "uptime_url"
     labels = {
-      project_id = var.project
+      project_id = var.monitoring-host-project
       host       = each.key
     }
   }
@@ -26,7 +26,7 @@ resource "google_monitoring_uptime_check_config" "https" {
 }
 
 resource "google_monitoring_alert_policy" "probers" {
-  project      = var.project
+  project      = var.monitoring-host-project
   display_name = "Host Down"
   combiner     = "OR"
   conditions {
diff --git a/terraform/alerting/variables.tf b/terraform/alerting/variables.tf
index 2f3fde4ad..383b1a027 100644
--- a/terraform/alerting/variables.tf
+++ b/terraform/alerting/variables.tf
@@ -1,5 +1,6 @@
-variable "project" {
-  type = string
+variable "monitoring-host-project" {
+  type        = string
+  description = "The host project for multi-project workspace. See also: http://cloud/monitoring/workspaces/create#first-multi-project-workspace"
 }
 
 variable "notification-email" {
diff --git a/terraform/alerting/workspace.tf b/terraform/alerting/workspace.tf
index 29c418d31..af3444926 100644
--- a/terraform/alerting/workspace.tf
+++ b/terraform/alerting/workspace.tf
@@ -19,7 +19,7 @@ resource "null_resource" "manual-step-to-enable-workspace" {
   provisioner "local-exec" {
     command = <<EOF
     echo -e '>>>> WARNING WARNING WARNING!'
-    echo -e '>>>> Please use https://console.cloud.google.com/monitoring/signup?project=${var.project}&nextPath=monitoring to create the first workspace.'
+    echo -e '>>>> Please use https://console.cloud.google.com/monitoring/signup?project=${var.monitoring-host-project}&nextPath=monitoring to create the first workspace.'
     echo -e '>>>> Terraform cannot create workspace yet, you can only create workspace via the Google Cloud Console.'
     echo -e '>>>> Related doc: https://cloud.google.com/monitoring/workspaces/create#single-project-workspace'
     EOF