storybook/docs/snippets/common/main-config-indexers-title.ts-4-9.mdx

```ts
// .storybook/main.ts

// Replace your-framework with the framework you are using (e.g., react-webpack5, vue3-vite)
import type { StorybookConfig } from '@storybook/your-framework';
import type { Indexer } from '@storybook/types';

const combosIndexer: Indexer = {
  test: /\.stories\.[tj]sx?$/,
  createIndex: async (fileName, { makeTitle }) => {
    // 👇 Grab title from fileName
    const title = fileName.match(/\/(.*)\.stories/)[1];

    // Read file and generate entries ...

    return entries.map((entry) => ({
      type: 'story',
      // 👇 Use makeTitle to format the title
      title: `${makeTitle(title)} Custom`,
      importPath: fileName,
      exportName: entry.name,
    }));
  },
};

const config: StorybookConfig = {
  framework: '@storybook/your-framework',
  stories: ['../src/**/*.mdx', '../src/**/*.stories.@(js|jsx|ts|tsx)'],
  experimental_indexers: async (existingIndexers) => [...existingIndexers, combosIndexer];
};

export default config;
```