diff --git a/src/services/models/Operation.ts b/src/services/models/Operation.ts
index 54905212..e26b4a4c 100644
--- a/src/services/models/Operation.ts
+++ b/src/services/models/Operation.ts
@@ -25,7 +25,6 @@ import type { OpenAPIParser } from '../OpenAPIParser';
 import type { RedocNormalizedOptions } from '../RedocNormalizedOptions';
 import type { MediaContentModel } from './MediaContent';
 import type { ContentItemModel, ExtendedOpenAPIOperation, IMenuItem } from '../types';
-import { MilesConstants } from '../../types';
 
 export interface XPayloadSample {
   lang: 'payload';
@@ -81,8 +80,6 @@ export class OperationModel implements IMenuItem {
   isWebhook: boolean;
   isEvent: boolean;
 
-  extraDescription: Record<string, boolean>;
-
   constructor(
     private parser: OpenAPIParser,
     private operationSpec: ExtendedOpenAPIOperation,
@@ -138,12 +135,6 @@ export class OperationModel implements IMenuItem {
         security => new SecurityRequirementModel(security, parser),
       );
 
-      if (operationSpec[MilesConstants.MILES_EXTRA_DESCRIPTION_PROPERTY_NAME] == undefined) {
-        this.extraDescription = operationSpec.extraDescription;
-      } else {
-        this.extraDescription = operationSpec[MilesConstants.MILES_EXTRA_DESCRIPTION_PROPERTY_NAME];
-      }
-
       this.servers = normalizeServers(
         parser.specUrl,
         operationSpec.servers || operationSpec.pathServers || parser.spec.servers || [],