diff --git a/cmd/generator/cloudspec/spec_modifier.go b/cmd/generator/cloudspec/spec_modifier.go
index 029450f2..5e628ff4 100644
--- a/cmd/generator/cloudspec/spec_modifier.go
+++ b/cmd/generator/cloudspec/spec_modifier.go
@@ -100,6 +100,15 @@ func Modify(cloudSpec *spec.Swagger) {
 				cloudSpec.Definitions[k].Properties[kk] = prop
 			}
 
+			addExtension := func(model string, field string, key string, value interface{}) {
+				if k == model && kk == field {
+					prop.AddExtension(key, value)
+					cloudSpec.Definitions[k].Properties[kk] = prop
+				}
+			}
+			addExtension("DeploymentCreateRequest", "alias", nullableKey, true)
+			addExtension("DeploymentUpdateRequest", "alias", nullableKey, true)
+
 			if k == "ElasticsearchConfiguration" {
 				if kk == "enabled_built_in_plugins" ||
 					kk == "user_bundles" ||
diff --git a/pkg/models/deployment_create_request.go b/pkg/models/deployment_create_request.go
index 5b64342b..c3b83382 100644
--- a/pkg/models/deployment_create_request.go
+++ b/pkg/models/deployment_create_request.go
@@ -36,7 +36,7 @@ import (
 type DeploymentCreateRequest struct {
 
 	// A user-defined alias to use in place of Cluster IDs for user-friendly URLs
-	Alias string `json:"alias,omitempty"`
+	Alias *string `json:"alias,omitempty"`
 
 	// Additional information about this deployment
 	Metadata *DeploymentCreateMetadata `json:"metadata,omitempty"`
diff --git a/pkg/models/deployment_update_request.go b/pkg/models/deployment_update_request.go
index 3637e008..828fea02 100644
--- a/pkg/models/deployment_update_request.go
+++ b/pkg/models/deployment_update_request.go
@@ -37,7 +37,7 @@ import (
 type DeploymentUpdateRequest struct {
 
 	// A user-defined alias to use in place of Cluster IDs for user-friendly URLs
-	Alias string `json:"alias,omitempty"`
+	Alias *string `json:"alias,omitempty"`
 
 	// Any new information about the current deployment object. If there is no new information the value is unchanged.
 	Metadata *DeploymentUpdateMetadata `json:"metadata,omitempty"`