diff --git a/maubot_llmplus/thrid_platform.py b/maubot_llmplus/thrid_platform.py
index 876080d..ff43476 100644
--- a/maubot_llmplus/thrid_platform.py
+++ b/maubot_llmplus/thrid_platform.py
@@ -1,5 +1,6 @@
 import asyncio
 import json
+import logging
 from collections import deque
 
 from typing import List
@@ -410,7 +411,11 @@ class Gemini(Platform):
                         text = part.get("text", "")
                         if text:
                             yield text
-                    if candidate.get("finishReason"):
+                    finish_reason = candidate.get("finishReason")
+                    if finish_reason:
+                        logging.getLogger("instance/aibot").debug(
+                            f"Gemini stream finished: finishReason={finish_reason}"
+                        )
                         break
                 except json.JSONDecodeError:
                     pass