diff --git a/manager/src/main/java/org/jiayunet/service/MentorMockChatService.java b/manager/src/main/java/org/jiayunet/service/MentorMockChatService.java
index e23dda8..5a9e117 100644
--- a/manager/src/main/java/org/jiayunet/service/MentorMockChatService.java
+++ b/manager/src/main/java/org/jiayunet/service/MentorMockChatService.java
@@ -66,7 +66,7 @@ public class MentorMockChatService {
         String aiResponse = aiChatAbility.chat(systemPrompt, userMessage);
         String json = AiResponseCleanTool.clean(aiResponse);
 
-        // 5. 入库（存在则更新，不存在则插入）
+        // 5. 入库（再查一次，防止并发期间已被其他线程插入）
         MentorMockChat existRecord = mentorMockChatMapper.selectOne(new LambdaQueryWrapper<MentorMockChat>().eq(MentorMockChat::getMentorId, mentorId));
         if (existRecord != null) {
             existRecord.setMessages(json);