diff --git a/clients/java/src/test/java/com/phrase/client/api/LocalesApiTest.java b/clients/java/src/test/java/com/phrase/client/api/LocalesApiTest.java
index ee5415418..29130c196 100644
--- a/clients/java/src/test/java/com/phrase/client/api/LocalesApiTest.java
+++ b/clients/java/src/test/java/com/phrase/client/api/LocalesApiTest.java
@@ -171,12 +171,13 @@ public void localeDownloadTest() throws ApiException, IOException, InterruptedEx
         Object customMetadataFilters = null;
         String translationKeyPrefix = null;
         Boolean filterByPrefix = null;
+        List<String> localeIds = null;
         File response = api.localeDownload(projectId, id, xPhraseAppOTP, ifModifiedSince, ifNoneMatch,
             branch, fileFormat, tags, tag, includeEmptyTranslations, excludeEmptyZeroForms,
             includeTranslatedKeys, keepNotranslateTags, convertEmoji, formatOptions, encoding,
             skipUnverifiedTranslations, includeUnverifiedTranslations, useLastReviewedVersion,
             fallbackLocaleId, sourceLocaleId, translationKeyPrefix, filterByPrefix,
-            customMetadataFilters);
+            customMetadataFilters, localeIds);
 
         String fileContents = new String(java.nio.file.Files.readAllBytes(response.toPath()));
         Assert.assertEquals("Correct file contents", fileContents, body);
diff --git a/doc/compiled.json b/doc/compiled.json
index 0cb78d3e7..8ed1af5e5 100644
--- a/doc/compiled.json
+++ b/doc/compiled.json
@@ -8582,6 +8582,21 @@
             },
             "style": "deepObject",
             "explode": true
+          },
+          {
+            "name": "locale_ids",
+            "description": "Locale IDs or locale names",
+            "in": "query",
+            "schema": {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            },
+            "example": [
+              "de",
+              "en"
+            ]
           }
         ],
         "responses": {
diff --git a/openapi-generator/templates/cli/api.handlebars b/openapi-generator/templates/cli/api.handlebars
index 49b3551d7..5d955721e 100644
--- a/openapi-generator/templates/cli/api.handlebars
+++ b/openapi-generator/templates/cli/api.handlebars
@@ -97,11 +97,16 @@ func init{{{nickname}}}() {
 						{{/isModel~}}
 						{{^isPrimitiveType}}{{^isModel}}
 							if params.IsSet(helpers.ToSnakeCase("{{paramName}}")) {
-								var {{paramName}} map[string]interface{}
-								if err := json.Unmarshal([]byte(params.GetString(helpers.ToSnakeCase("{{{vendorExtensions.x-export-param-name}}}"))), &{{paramName}}); err != nil {
+							{{#if (eq dataType "[]string")}}
+									var {{paramName}} []string
+							{{else}}
+									var {{paramName}} map[string]interface{}
+							{{/if}}
+
+								if err := json.Unmarshal([]byte(params.GetString(helpers.ToSnakeCase("{{{paramName}}}"))), &{{paramName}}); err != nil {
 									HandleError(err)
 								}
-								localVarOptionals.{{{vendorExtensions.x-export-param-name}}} = optional.NewInterface({{paramName}})
+								localVarOptionals.{{{vendorExtensions.x-export-param-name}}} = {{#if (eq dataType "[]string")}}{{paramName}}{{else}}optional.NewInterface({{paramName}}){{/if}}
 							}
 						{{/isModel}}{{/isPrimitiveType}}
 					{{/if}}
diff --git a/openapi-generator/templates/go/api.mustache b/openapi-generator/templates/go/api.mustache
index b050db124..993a31910 100644
--- a/openapi-generator/templates/go/api.mustache
+++ b/openapi-generator/templates/go/api.mustache
@@ -36,7 +36,12 @@ type {{#structPrefix}}{{&classname}}{{/structPrefix}}{{{nickname}}}Opts struct {
 {{/isBinary}}
 {{/isPrimitiveType}}
 {{^isPrimitiveType}}
-	{{vendorExtensions.x-export-param-name}} optional.Interface `json:"{{baseName}}{{^required}},omitempty{{/required}}"{{#withXml}} xml:"{{baseName}}{{#isXmlAttribute}},attr{{/isXmlAttribute}}"{{/withXml}}{{#vendorExtensions.x-go-custom-tag}} {{{.}}}{{/vendorExtensions.x-go-custom-tag}}`
+	{{#isArray}}
+		{{vendorExtensions.x-export-param-name}} []string `json:"{{baseName}}{{^required}},omitempty{{/required}}"{{#withXml}} xml:"{{baseName}}{{#isXmlAttribute}},attr{{/isXmlAttribute}}"{{/withXml}}{{#vendorExtensions.x-go-custom-tag}} {{{.}}}{{/vendorExtensions.x-go-custom-tag}}`
+	{{/isArray}}
+	{{^isArray}}
+		{{vendorExtensions.x-export-param-name}} optional.Interface `json:"{{baseName}}{{^required}},omitempty{{/required}}"{{#withXml}} xml:"{{baseName}}{{#isXmlAttribute}},attr{{/isXmlAttribute}}"{{/withXml}}{{#vendorExtensions.x-go-custom-tag}} {{{.}}}{{/vendorExtensions.x-go-custom-tag}}`
+	{{/isArray}}
 {{/isPrimitiveType}}
 {{/required}}
 {{/allParams}}
@@ -154,8 +159,15 @@ func (a *{{{classname}}}Service) {{{nickname}}}(ctx _context.Context{{#hasParams
 	{{/isCollectionFormatMulti}}
 	{{/required}}
 	{{^required}}
-	if localVarOptionals != nil && localVarOptionals.{{vendorExtensions.x-export-param-name}}.IsSet() {
+	if localVarOptionals != nil && localVarOptionals.{{vendorExtensions.x-export-param-name}}{{^isArray}}.IsSet(){{/isArray}}{{#isArray}} != nil{{/isArray}} {
 	{{#isCollectionFormatMulti}}
+		{{#isArray}}
+		t := localVarOptionals.{{vendorExtensions.x-export-param-name}}
+		for i := range t {
+			localVarQueryParams.Add("{{baseName}}[]", parameterToString(t[i], "multi"))
+		}
+		{{/isArray}}
+		{{^isArray}}
 		t:=localVarOptionals.{{vendorExtensions.x-export-param-name}}.Value()
 		if reflect.TypeOf(t).Kind() == reflect.Slice {
 			s := reflect.ValueOf(t)
@@ -165,6 +177,7 @@ func (a *{{{classname}}}Service) {{{nickname}}}(ctx _context.Context{{#hasParams
 		} else {
 			localVarQueryParams.Add("{{baseName}}", parameterToString(t, "{{#collectionFormat}}{{collectionFormat}}{{/collectionFormat}}"))
 		}
+		{{/isArray}}
 	{{/isCollectionFormatMulti}}
 	{{^isCollectionFormatMulti}}
 		{{#isPrimitiveType}}localVarQueryParams.Add("{{baseName}}", parameterToString(localVarOptionals.{{vendorExtensions.x-export-param-name}}.Value(), "{{#collectionFormat}}{{collectionFormat}}{{/collectionFormat}}")){{/isPrimitiveType}}{{^isPrimitiveType}}for key, value := range localVarOptionals.{{vendorExtensions.x-export-param-name}}.Value().(map[string]interface{}) {
diff --git a/paths/locales/download.yaml b/paths/locales/download.yaml
index 406b55be8..884499590 100644
--- a/paths/locales/download.yaml
+++ b/paths/locales/download.yaml
@@ -133,6 +133,16 @@ parameters:
       properties: {}
     style: deepObject
     explode: true
+  - name: locale_ids
+    description: Locale IDs or locale names
+    in: query
+    schema:
+      type: array
+      items:
+        type: string
+    example:
+      - de
+      - en
 responses:
   "200":
     description: OK