diff --git a/scripts/ci/step_timer_start.sh b/scripts/ci/step_timer_start.sh
index 7d4e7c1b0..503143a6d 100755
--- a/scripts/ci/step_timer_start.sh
+++ b/scripts/ci/step_timer_start.sh
@@ -2,3 +2,4 @@
 # CI 公共步骤：Job 开始计时
 echo "JOB_START_TIME=$(date +%s)" >> $GITHUB_ENV
 echo "Job started at $(date)"
+# trigger CI run for PR validation
\ No newline at end of file