diff --git a/README.md b/README.md
index 3df43e3..29f66d9 100644
--- a/README.md
+++ b/README.md
@@ -205,7 +205,7 @@ asked by `configure.py --full`) can post when a stream starts.
    embedded outpost → group policy (e.g. everyone in the server, or `streamers`+`editors`+`admins`).
 3. Dev box: `./deployLive.sh` builds `live/` and copies `dist/` to `/srv/live` (Caddy serves it directly).
 
-**Go Live** button: broadcast a window from the browser (no OBS) as `<user>/HelmetCam-<date>` — key comes
+**Go Live** button (Chrome/Edge 141+ for window audio): broadcast a window from the browser (no OBS) as `<user>/HelmetCam-<date>` — key comes
 from `/me/stream-key` (dumpd reads `/etc/vanguard/streamers.json`, identity from the Authentik header), so a
 streamer's Authentik username must equal their MediaMTX name.
 
diff --git a/live/README.md b/live/README.md
index 4761422..6b281ce 100644
--- a/live/README.md
+++ b/live/README.md
@@ -22,6 +22,6 @@ Toolbar → **Go Live**: closes all viewer windows, fetches the logged-in user's
 `/me/stream-key` (dumpd, identity from Authentik's header), opens Chrome's window picker (windows only,
 audio requested), and publishes over WebRTC/WHIP to `<user>/HelmetCam-<date>` at ≤12 Mbps, H.264, up to
 1440p60. Recording, the "is live" post, the sweep and Jellyfin follow exactly as for an OBS stream.
-Window audio: Chrome on Windows. Linux/Mac: pick a tab or the whole screen for sound.
+Window audio: Chrome/Edge 141+ (`windowAudio: "window"`); older browsers share the window without sound.
 Requires the Authentik username to equal the MediaMTX streamer name (configure.py keeps them in sync via
 `/etc/vanguard/streamers.json`).
diff --git a/live/src/GoLive.jsx b/live/src/GoLive.jsx
index 2bbb101..5bf87d4 100644
--- a/live/src/GoLive.jsx
+++ b/live/src/GoLive.jsx
@@ -66,8 +66,8 @@ export default function GoLive({ onExit }) {
             <input value={title} onChange={e => setTitle(e.target.value)} disabled={phase === 'capturing'} />
             <div className="hint">
               Click <b>Start</b>, then pick the <b>WarDogs</b> window in Chrome's dialog and tick <b>Share audio</b>.
-              Window audio works in Chrome on Windows; on Linux/Mac pick a tab or the whole screen for sound.
-              Capped at {MAX_KBPS / 1000} Mbps, up to 1440p60, H.264.
+              Window audio needs <b>Chrome or Edge 141 or newer</b> (chrome://version). Older browsers capture the window
+              without sound. Capped at {MAX_KBPS / 1000} Mbps, up to 1440p60, H.264.
             </div>
             {err && <div className="err">{err}</div>}
             <button className="primary" disabled={!key || phase === 'capturing'} onClick={start}>{phase === 'capturing' ? 'Waiting for the window picker…' : 'Start'}</button>
diff --git a/live/src/broadcast.js b/live/src/broadcast.js
index a2c7767..99c8fa3 100644
--- a/live/src/broadcast.js
+++ b/live/src/broadcast.js
@@ -10,14 +10,15 @@ export function defaultTitle(now = new Date()) {
 export const cleanTitle = t => t.trim().replace(/\s+/g, '-').replace(/[^A-Za-z0-9_.-]/g, '')
 
 export async function captureWindow() {
-  // Window-only picker with audio. Chrome on Windows captures that window's audio; elsewhere the user
-  // should pick a tab or the whole screen to get sound.
+  // Window-only picker with that window's own audio. Chrome/Edge 141+ honour windowAudio: "window"
+  // (only the shared window's sound); older Chrome offers no audio for a window at all.
   const constraints = {
     video: { displaySurface: 'window', frameRate: { ideal: 60, max: 60 }, width: { max: 2560 }, height: { max: 1440 } },
     audio: { echoCancellation: false, noiseSuppression: false, autoGainControl: false, sampleRate: 48000, channelCount: 2 },
-    systemAudio: 'include',
+    windowAudio: 'window',            // capture the picked window's audio (Chrome 141+)
+    systemAudio: 'exclude',
     selfBrowserSurface: 'exclude',
-    monitorTypeSurfaces: 'exclude',   // hide "Entire screen" so people pick the game window
+    monitorTypeSurfaces: 'exclude',   // hide "Entire screen": this is a single-window helmet cam
     surfaceSwitching: 'include',
     preferCurrentTab: false,
   }