diff --git a/scripts/serve-web.py b/scripts/serve-web.py
index 65a2564..cddb599 100644
--- a/scripts/serve-web.py
+++ b/scripts/serve-web.py
@@ -14,9 +14,12 @@ class IsolatedHandler(SimpleHTTPRequestHandler):
 def main():
     parser = argparse.ArgumentParser()
     parser.add_argument("--port", type=int, default=8000)
+    parser.add_argument("--host", default="0.0.0.0")
     args = parser.parse_args()
-    server = ThreadingHTTPServer(("127.0.0.1", args.port), IsolatedHandler)
-    print(f"Open http://127.0.0.1:{args.port}/web/")
+    server = ThreadingHTTPServer((args.host, args.port), IsolatedHandler)
+    print(f"Serving on http://{args.host}:{args.port}/web/")
+    print("Note: WASM pthreads need a secure context — use localhost or HTTPS; a"
+          " bare LAN IP over HTTP is not cross-origin isolated.")
     server.serve_forever()