diff --git a/cli/src/commands/format.ts b/cli/src/commands/format.ts
index 6690ef0d5..7756be45e 100644
--- a/cli/src/commands/format.ts
+++ b/cli/src/commands/format.ts
@@ -21,11 +21,12 @@ export default class Format extends Command {
     'order-by': flags.string({
       default: 'index',
       description: 'Order of the keys',
-      options: ['index', 'key'],
+      options: ['index', 'key', '-index', '-key'],
     }),
   };
 
   async run() {
+    const {flags} = this.parse(Format);
     const documents = this.projectConfig.files();
     const t0 = process.hrtime();
     const formattedPaths: FormattedFile[] = [];
@@ -44,7 +45,7 @@ export default class Format extends Command {
 
         if (fs.existsSync(path)) {
           const beforeContent = fs.readFileSync(path);
-          await document.format(path, language);
+          await document.format(path, language, flags);
           const unchanged = fs.readFileSync(path).equals(beforeContent);
 
           formattedPaths.push({path, unchanged});
diff --git a/cli/src/services/document.ts b/cli/src/services/document.ts
index 72aa95c2d..4b43254b8 100644
--- a/cli/src/services/document.ts
+++ b/cli/src/services/document.ts
@@ -25,6 +25,10 @@ const throwOnServerError = async (response: Response) => {
   }
 };
 
+interface FormatOptions {
+  'order-by': string;
+}
+
 export default class Document {
   paths: string[];
   readonly apiKey: string;
@@ -46,7 +50,7 @@ export default class Document {
     this.paths = new Tree(this.config).list();
   }
 
-  async format(file: string, language: string) {
+  async format(file: string, language: string, options: FormatOptions) {
     const formData = new FormData();
 
     formData.append('file', fs.createReadStream(file));
@@ -54,6 +58,7 @@ export default class Document {
     formData.append('document_format', this.config.format);
     formData.append('language', language);
     if (this.projectId) formData.append('project_id', this.projectId);
+    if (options['order-by']) formData.append('order_by', options['order-by']);
 
     const url = `${this.apiUrl}/format`;