storybook/docs/snippets/common/component-story-custom-source.js.mdx

```js
// Button.stories.js|jsx|ts|tsx

import { Button } from './Button';

export default {
  /* 👇 The title prop is optional.
   * See https://storybook.js.org/docs/react/configure/overview#configure-story-loading
   * to learn how to generate automatic titles
   */
  title: 'Button',
  component: Button,
};

export const Template = (args) => ({
  //👇 Your template goes here
});

export const CustomSource = Template.bind({});
CustomSource.parameters = {
  docs: {
    source: {
      code: 'Some custom string here',
    },
  },
};
```