diff --git a/builtin/providers/aws/resource_aws_elasticache_cluster.go b/builtin/providers/aws/resource_aws_elasticache_cluster.go
index 8c0a3bdb04..48b8db0dad 100644
--- a/builtin/providers/aws/resource_aws_elasticache_cluster.go
+++ b/builtin/providers/aws/resource_aws_elasticache_cluster.go
@@ -52,8 +52,7 @@ func resourceAwsElasticacheCluster() *schema.Resource {
 			},
 			"port": &schema.Schema{
 				Type:     schema.TypeInt,
-				Default:  11211,
-				Optional: true,
+				Required: true,
 				ForceNew: true,
 			},
 			"engine_version": &schema.Schema{
@@ -123,7 +122,7 @@ func resourceAwsElasticacheClusterCreate(d *schema.ResourceData, meta interface{
 	numNodes := int64(d.Get("num_cache_nodes").(int)) // 2
 	engine := d.Get("engine").(string)                // memcached
 	engineVersion := d.Get("engine_version").(string) // 1.4.14
-	port := int64(d.Get("port").(int))                // 11211
+	port := int64(d.Get("port").(int))                // e.g) 11211
 	subnetGroupName := d.Get("subnet_group_name").(string)
 	securityNameSet := d.Get("security_group_names").(*schema.Set)
 	securityIdSet := d.Get("security_group_ids").(*schema.Set)
diff --git a/builtin/providers/aws/resource_aws_elasticache_cluster_test.go b/builtin/providers/aws/resource_aws_elasticache_cluster_test.go
index 20bfe4f416..c5e12ebd8c 100644
--- a/builtin/providers/aws/resource_aws_elasticache_cluster_test.go
+++ b/builtin/providers/aws/resource_aws_elasticache_cluster_test.go
@@ -96,7 +96,7 @@ func genRandInt() int {
 }
 
 var testAccAWSElasticacheClusterConfig = fmt.Sprintf(`
-provider "aws" { 
+provider "aws" {
 	region = "us-east-1"
 }
 resource "aws_security_group" "bar" {
@@ -121,6 +121,7 @@ resource "aws_elasticache_cluster" "bar" {
     engine = "memcached"
     node_type = "cache.m1.small"
     num_cache_nodes = 1
+    port = 11211
     parameter_group_name = "default.memcached1.4"
     security_group_names = ["${aws_elasticache_security_group.bar.name}"]
 }
diff --git a/website/source/docs/providers/aws/r/elasticache_cluster.html.markdown b/website/source/docs/providers/aws/r/elasticache_cluster.html.markdown
index 25c6baf000..60f91b88a7 100644
--- a/website/source/docs/providers/aws/r/elasticache_cluster.html.markdown
+++ b/website/source/docs/providers/aws/r/elasticache_cluster.html.markdown
@@ -17,6 +17,7 @@ resource "aws_elasticache_cluster" "bar" {
     cluster_id = "cluster-example"
     engine = "memcached"
     node_type = "cache.m1.small"
+    port = 11211
     num_cache_nodes = 1
     parameter_group_name = "default.memcached1.4"
 }
@@ -47,8 +48,8 @@ value must be between 1 and 20
 * `parameter_group_name` – (Required) Name of the parameter group to associate
 with this cache cluster
 
-* `port` – (Optional) The port number on which each of the cache nodes will
-accept connections. Default 11211.
+* `port` – (Required) The port number on which each of the cache nodes will
+accept connections. For Memcache the default is 11211, and for Redis the default port is 6379.
 
 * `subnet_group_name` – (Optional, VPC only) Name of the subnet group to be used
 for the cache cluster.