diff --git a/.openclaw-sync/source.json b/.openclaw-sync/source.json
index 92e3f371a..a424fcecb 100644
--- a/.openclaw-sync/source.json
+++ b/.openclaw-sync/source.json
@@ -1,5 +1,5 @@
 {
   "repository": "openclaw/openclaw",
-  "sha": "9f2c8a6ab62582a5af931ff80e590419f143080e",
-  "syncedAt": "2026-05-04T22:29:05.651Z"
+  "sha": "f8e080386d8bcad6b90052e97ea9ba16584be30c",
+  "syncedAt": "2026-05-04T22:37:59.345Z"
 }
diff --git a/docs/help/debugging.md b/docs/help/debugging.md
index 073cfed9c..1e24d01df 100644
--- a/docs/help/debugging.md
+++ b/docs/help/debugging.md
@@ -157,6 +157,9 @@ Use `--benchmark-dir <path>` when you want profiles somewhere else.
 Use `--benchmark-no-force` when you want the benchmarked child to skip the
 default `--force` port cleanup and fail fast if the Gateway port is already in
 use.
+Benchmark mode suppresses sync-I/O trace spam by default. Set
+`OPENCLAW_TRACE_SYNC_IO=1` with `--benchmark` when you explicitly want both CPU
+profiles and Node sync-I/O stack traces.
 
 The tmux wrapper carries common non-secret runtime selectors such as
 `OPENCLAW_PROFILE`, `OPENCLAW_CONFIG_PATH`, `OPENCLAW_STATE_DIR`,