diff --git a/app/angular/src/server/framework-preset-angular-cli.ts b/app/angular/src/server/framework-preset-angular-cli.ts
index 6f6b0601cf73..9b46c9059127 100644
--- a/app/angular/src/server/framework-preset-angular-cli.ts
+++ b/app/angular/src/server/framework-preset-angular-cli.ts
@@ -3,6 +3,7 @@ import { logger } from '@storybook/node-logger';
 import { targetFromTargetString, BuilderContext, Target } from '@angular-devkit/architect';
 import { sync as findUpSync } from 'find-up';
 import semver from '@storybook/semver';
+import dedent from 'ts-dedent';
 
 import { logging, JsonObject } from '@angular-devkit/core';
 import { moduleIsAvailable } from './utils/module-is-available';
@@ -142,8 +143,12 @@ async function getLegacyDefaultBuildOptions(options: PresetOptions) {
     return {};
   }
 
-  // TODO ~ legacy way to get default options
-  // TODO ~ Add deprecation warning and ex for builder use ? `);
+  logger.warn(dedent`Your Storybook startup uses a solution that will not be supported in version 7.0. 
+            You must use angular builder to have an explicit configuration on the project used in angular.json
+            Read more at:
+            - https://github.com/storybookjs/storybook/blob/next/MIGRATION.md#sb-angular-builder)
+            - https://github.com/storybookjs/storybook/blob/next/MIGRATION.md#angular13)
+          `);
   const dirToSearch = process.cwd();
 
   // Read angular workspace