VSCode automatically adds a comment on save

I am working on a website in VSCode and whenever I save a file, it automatically adds a comment at the top of the document. It does it in both HTML, CSS and Javascript files.

I don’t know what is causing it?

I use Prettier as formatter but I can’t find any information on this online.

I tried looking in my .settings file, but the only thing that appears there is editor.formatOnSave: true. I also tried looking it up online but I can’t find anything like this anywhere.