diff --git a/doc/_resource_types/ecs_service.md b/doc/_resource_types/ecs_service.md
index 0f357326..93334424 100644
--- a/doc/_resource_types/ecs_service.md
+++ b/doc/_resource_types/ecs_service.md
@@ -1,7 +1,9 @@
 ### exist
 
+You can set `cluster` ( default: `default` ).
+
 ```ruby
-describe ecs_service('my-ecs-service') do
+describe ecs_service('my-ecs-service'), cluster: 'my-ecs-cluster' do
   it { should exist }
 end
 ```
@@ -9,7 +11,7 @@ end
 ### be_active, be_draining, be_inactive
 
 ```ruby
-describe ecs_service('my-ecs-service') do
+describe ecs_service('my-ecs-service'), cluster: 'my-ecs-cluster' do
   it { should be_active }
 end
 ```
diff --git a/doc/resource_types.md b/doc/resource_types.md
index d48180c7..8ce098b2 100644
--- a/doc/resource_types.md
+++ b/doc/resource_types.md
@@ -1275,8 +1275,10 @@ ECS Service resource type.
 
 ### exist
 
+You can set `cluster` ( default: `default` ).
+
 ```ruby
-describe ecs_service('my-ecs-service') do
+describe ecs_service('my-ecs-service'), cluster: 'my-ecs-cluster' do
   it { should exist }
 end
 ```
@@ -1285,7 +1287,7 @@ end
 ### be_active, be_draining, be_inactive
 
 ```ruby
-describe ecs_service('my-ecs-service') do
+describe ecs_service('my-ecs-service'), cluster: 'my-ecs-cluster' do
   it { should be_active }
 end
 ```