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8 changes: 6 additions & 2 deletions docs/studio-app/reference-video.mdx
Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,12 @@ like is still a better start than a blank page.
*Pick a reference from the feed: it's a person talking to camera, so the app goes to **Copy editing style**. Choose who's
on camera, then say what the video should talk about.*

Reference uses your HeyGen API key: the app watches the video through HeyGen, which uses your API balance. Add the
key in **Settings** > **HeyGen API key**, or when the app asks.
Reference is part of [HyperFrames Pro](https://hyperframes.studio/pricing): the app watches the video through HeyGen,
and Pro credits pay for the read when they're available. A usable HeyGen API key saved in **Settings** > **HeyGen API
key** pays when the plan can't. A saved key with an empty balance makes the app ask for a key before the read starts;
remove it in **Settings** to let Pro pay. With no plan that can pay and no usable key, the app asks you to get Pro or
add a key, opening **Plan & usage** if Pro's allowance for the month is used up, and it picks up the selected video again
once your plan can pay.

## 1. Pick the video

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