diff --git a/docs/studio-app/reference-video.mdx b/docs/studio-app/reference-video.mdx
index 8c64275bbcc..3bdc15c78d4 100644
--- a/docs/studio-app/reference-video.mdx
+++ b/docs/studio-app/reference-video.mdx
@@ -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