diff --git a/apps/stage-pocket/README.md b/apps/stage-pocket/README.md
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--- a/apps/stage-pocket/README.md
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@@ -5,3 +5,13 @@
 </p>
 
 > Heavily inspired by [Neuro-sama](https://www.youtube.com/@Neurosama)
+
+## WebSocket Bridge
+
+Stage Pocket adds a host-backed WebSocket bridge for `@proj-airi/server-sdk`.
+
+Design constraints:
+- keep page loading on secure origins (`https` or app-hosted local origins) to preserve secure-context web APIs
+- only implement the WebSocket bridge needed by `@proj-airi/server-sdk`
+- native owns socket I/O; `server-sdk` owns reconnect, heartbeat, authentication, and connection state
+- the bridge only forwards `connect`, `send`, `close`, `open`, `message`, `error`, and `close`