> For the complete documentation index, see [llms.txt](https://attr.sygnal.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://attr.sygnal.com/sa5-video/quick-start.md).
# Quick Start | SA5 Video
## How to Add the Library
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**IMPORTANT** \
We've made some enhancements to SA5 Core in v5.5.0. \
If you are already using other SA5 Libs, please make certain to upgrade them to at least v5.5.0 as well to ensure cross-compatibility.
{% endhint %}
[Add this script](/overview/how-to-add-custom-code.md) to the **page-specific** or **site wide** custom code **HEAD** area of your site or page.
{% code overflow="wrap" %}
```html
```
{% endcode %}
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Once the library is installed, use the attributes you want for the specific features you're looking for in this library. Those are documented with each feature.
{% endhint %}
Add the custom attributes for the features you need, described in each feature separately.
## SA5 Library Developers
For SA5 library developers, use the extended syntax to support [Sygnal Devmode](https://devmode.sygnal.com/) and [Sygnal DevProxy](https://engine.sygnal.com/devproxy). These make it easier to develop and test code changes with Webflow sites.
{% code overflow="wrap" %}
```html
```
{% endcode %}