diff --git a/monitor.py b/monitor.py
index f14aa45..c742958 100644
--- a/monitor.py
+++ b/monitor.py
@@ -3305,6 +3305,7 @@ class MessageMonitor:
                 _norm_rl = self._norm_frag(rl)
                 if _norm_rl and _norm_rl in _known_bot_replies:
                     _is_bot_reply_line = True
+                    logger.debug(f"[ocr] 行合并跳过(bot回复): {rl[:60]!r}")
             if merged_lines and not _SENT_END.search(merged_lines[-1]) \
                     and not _TS_START.match(rl) and not _TS_START.match(merged_lines[-1]) \
                     and not _is_bot_reply_line: