> For the complete documentation index, see [llms.txt](https://prismdx.gitbook.io/rsst/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prismdx.gitbook.io/rsst/documentation/upgrade-system/blueprint-interface-upgrade-listener.md).

# Blueprint Interface : Upgrade listener

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This is added to actors to be able to "listen" to when upgrades are purchased / loaded. Allowing us to add custom logic for each actor when an upgrade is aquired and when it loads the upgrade from save.
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### Tutorial video

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Here is a short tutorial video showing the process.
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{% embed url="<https://youtu.be/gZB2n7Od0LI>" %}