diff --git a/ecs-service.cfndsl.rb b/ecs-service.cfndsl.rb
index 8262dc5..7b7bf75 100644
--- a/ecs-service.cfndsl.rb
+++ b/ecs-service.cfndsl.rb
@@ -427,6 +427,7 @@
 
 
   strategy = external_parameters.fetch(:scheduling_strategy, nil)
+  task_placement_distinct_instance_constraint = external_parameters.fetch(:distinct_instance_constraint, false)
   health_check_grace_period = external_parameters.fetch(:health_check_grace_period, nil)
   placement_strategies = external_parameters.fetch(:placement_strategies, nil)
   ECS_Service('Service') do
@@ -444,6 +445,7 @@
     TaskDefinition Ref('Task')
     SchedulingStrategy scheduling_strategy if !strategy.nil?
     PlacementStrategies placement_strategies if !placement_strategies.nil?
+    PlacementConstraints [{Type: "distinctInstance"}] if task_placement_distinct_instance_constraint
 
     if service_loadbalancer.any?
       Role Ref('Role') unless awsvpc_enabled
diff --git a/ecs-service.config.yaml b/ecs-service.config.yaml
index 03e2c53..123d4cf 100644
--- a/ecs-service.config.yaml
+++ b/ecs-service.config.yaml
@@ -13,9 +13,10 @@ log_retention: 7
 #
 # volumes:
 #   - data-volume:/data
-# NOTE: task placement constraint only suport Type="memberOf"
+# NOTE: task_placement_constraint only suport Type="memberOf". Use distinct_instance_constraint: true for Type="distinctInstance"
 # task_placement_constraints:
 #   - "attribute:ecs.availability-zone==ap-southeast-2a"     
+# distinct_instance_constraint: true
 #
 # placement_strategies:
 # - Field: memory