diff --git a/docs/acceptance/b171-batch2.md b/docs/acceptance/b171-batch2.md
index 5c8d9c4..df0ad50 100644
--- a/docs/acceptance/b171-batch2.md
+++ b/docs/acceptance/b171-batch2.md
@@ -31,9 +31,9 @@
 
 | 主题 | SHA | 主要文件 |
 |---|---|---|
-| 未听红点、录音浮层入场/取消区、50–60s 时限、searchBg | 见当次提交 | `chat_voice_*.dart`、`chat_item_view.dart`、`chat_input_box.dart`、`apply_official_styles.dart`、`styles.dart` |
+| 未听红点、录音浮层入场/取消区、50–60s 时限、searchBg | `15d7f1935e38c18d127319346cf03d278b596b2c` | `chat_voice_*.dart`、`chat_item_view.dart`、`chat_input_box.dart`、`apply_official_styles.dart`、`styles.dart` |
 
-回退 B-189：`git revert <当次 SHA>`
+回退 B-189：先 `git revert` 本补记提交，再 `git revert 15d7f1935e38c18d127319346cf03d278b596b2c`。
 
 静态核对（对照代码，非运行）：