# guessSyntax

**URL:** <https://discourse.gohugo.io/t/guesssyntax/31080>\
**Category:** support\
**Created:** [February 6, 2021, 7:10am UTC](https://discourse.gohugo.io/t/guesssyntax/31080 "2021-02-06T07:10:56Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![aks](https://avatars.discourse-cdn.com/v4/letter/a/3e96dc/32.png) [@aks](https://discourse.gohugo.io/u/aks)\
**Post date:** [February 6, 2021, 7:10am UTC](https://discourse.gohugo.io/t/guesssyntax/31080/1 "2021-02-06T07:10:56Z")

</div>

On this page [https://gohugo.io/getting-started/configuration-markup#highlight](https://gohugo.io/getting-started/configuration-markup#highlight) on the syntax highlighting section it mentions `guessSyntax` as a markup configuration option.

I couldn’t find any information about what this does, but I am guessing that if this is set to `true` then it will try to guess the default syntax inside any codeblock, in-case you don’t specify it manually (like adding `js` or `css` to specify which syntax highlighting to use in a code-fence:

````auto
 ``` js
 console.log('test');

````

When I set it to `true`, it does try to insert some `css` classes for highlighting, but its setting it to `class=“language-fallback”.

It works when I specify which syntax to use manually in each code block. Is it necessary to always specify this manually in each code block or is it possible to make it automatic? Thanks