diff --git a/ec/armada/schema_armada.go b/ec/armada/schema_armada.go
index 09e5d69..3857571 100644
--- a/ec/armada/schema_armada.go
+++ b/ec/armada/schema_armada.go
@@ -9,6 +9,11 @@ import (
 
 func armadaSchema() map[string]*schema.Schema {
 	return map[string]*schema.Schema{
+		"instance": {
+			Type:        schema.TypeString,
+			Description: "Name is an instance name configured in the provider.",
+			Optional:    true,
+		},
 		"metadata": {
 			Type:        schema.TypeList,
 			Description: "Standard object's metadata.",
diff --git a/ec/armada/schema_armadaset.go b/ec/armada/schema_armadaset.go
index d5d2bc4..0735f39 100644
--- a/ec/armada/schema_armadaset.go
+++ b/ec/armada/schema_armadaset.go
@@ -9,6 +9,11 @@ import (
 
 func armadaSetSchema() map[string]*schema.Schema {
 	return map[string]*schema.Schema{
+		"instance": {
+			Type:        schema.TypeString,
+			Description: "Name is an instance name configured in the provider.",
+			Optional:    true,
+		},
 		"metadata": {
 			Type:        schema.TypeList,
 			Description: "Standard object's metadata.",
diff --git a/ec/container/schema_branch.go b/ec/container/schema_branch.go
index ed0c062..7c1a5d7 100644
--- a/ec/container/schema_branch.go
+++ b/ec/container/schema_branch.go
@@ -9,6 +9,11 @@ import (
 
 func branchSchema() map[string]*schema.Schema {
 	return map[string]*schema.Schema{
+		"instance": {
+			Type:        schema.TypeString,
+			Description: "Name is an instance name configured in the provider.",
+			Optional:    true,
+		},
 		"metadata": {
 			Type:        schema.TypeList,
 			Description: "Standard object's metadata.",
diff --git a/ec/core/schema_region.go b/ec/core/schema_region.go
index 990d026..edb29f1 100644
--- a/ec/core/schema_region.go
+++ b/ec/core/schema_region.go
@@ -9,6 +9,11 @@ import (
 
 func regionSchema() map[string]*schema.Schema {
 	return map[string]*schema.Schema{
+		"instance": {
+			Type:        schema.TypeString,
+			Description: "Name is an instance name configured in the provider.",
+			Optional:    true,
+		},
 		"metadata": {
 			Type:        schema.TypeList,
 			Description: "Standard object's metadata.",
diff --git a/ec/core/schema_site.go b/ec/core/schema_site.go
index 5431efd..14197ec 100644
--- a/ec/core/schema_site.go
+++ b/ec/core/schema_site.go
@@ -9,6 +9,11 @@ import (
 
 func siteSchema() map[string]*schema.Schema {
 	return map[string]*schema.Schema{
+		"instance": {
+			Type:        schema.TypeString,
+			Description: "Name is an instance name configured in the provider.",
+			Optional:    true,
+		},
 		"metadata": {
 			Type:        schema.TypeList,
 			Description: "Standard object's metadata.",