> For the complete documentation index, see [llms.txt](https://docs.vale.sh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vale.sh/keys/commentdelimiters.md).

# CommentDelimiters

Learn how to define custom comment delimiters.

`CommentDelimiters` allow you to override standard HTML comment delimiters (`<!-- foo -->`).

Custom comment delimiters are useful when using non-standard markup which do not allow HTML-style comments, such as MDX.

```ini
[formats]
mdx = md

[*.mdx]
BasedOnStyles = Vale

CommentDelimiters = {/*, */}
```

When `CommentDelimiters` are set, you can take full advantage of markup-based configuration to enable or disable specific rules within a section.

For instance, when using MDX:

```mdx
{/* vale off */}

This is some text ACT test

This is some text ACT test

{/* vale on */}

{/* vale vale.Redundancy = NO */}

This is some text ACT test

{/* vale vale.Redundancy = YES */}
```

Related keys: [TokenIgnores](/keys/tokenignores.md) [Transform](/keys/transform.md)


---

# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.vale.sh/keys/commentdelimiters.md?ask=<question>&goal=<endgoal>
```

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`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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