diff --git a/metagpt/provider/google_gemini_api.py b/metagpt/provider/google_gemini_api.py
index 1c866ebad..a69ffdc28 100644
--- a/metagpt/provider/google_gemini_api.py
+++ b/metagpt/provider/google_gemini_api.py
@@ -36,6 +36,8 @@ class GeminiGPTAPI(BaseGPTAPI):
         genai.configure(api_key=config.gemini_api_key)
 
     def _user_msg(self, msg: str) -> dict[str, str]:
+        # Not to change BaseGPTAPI default functions but update with Gemini's conversation format.
+        # You should follow the format.
         return {"role": "user", "parts": [msg]}
 
     def _assistant_msg(self, msg: str) -> dict[str, str]: