diff --git a/packages/playwright-core/src/server/trace/viewer/traceViewer.ts b/packages/playwright-core/src/server/trace/viewer/traceViewer.ts
index a2251c5e22..2d611f5cca 100644
--- a/packages/playwright-core/src/server/trace/viewer/traceViewer.ts
+++ b/packages/playwright-core/src/server/trace/viewer/traceViewer.ts
@@ -112,6 +112,7 @@ export async function installRootRedirect(server: HttpServer, traceUrls: string[
       continue;
     }
 
+    // <testServerOrigin>/trace/file?path=/path/to/trace.zip
     const url = new URL('/trace/file', server.urlPrefix('precise'));
     url.searchParams.set('path', traceUrl);
     params.append('trace', url.toString());