> For the complete documentation index, see [llms.txt](https://changelog.agnostic.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://changelog.agnostic.dev/september-2023/15-september-custom-variables-on-charts.md).

# 15 September: Custom variables on charts

Custom variables in the SQL of charts empower you to introduce dynamic elements into your queries. These variables serve as placeholders that you can define and manipulate within the SQL code. This functionality enhances the adaptability of charts by allowing you to customize aspects of your queries based on specific conditions or criteria.