diff --git a/aider/sendchat.py b/aider/sendchat.py
index a61ac5549..8cd635d8c 100644
--- a/aider/sendchat.py
+++ b/aider/sendchat.py
@@ -15,6 +15,7 @@ CACHE = None
 
 RETRY_TIMEOUT = 60
 
+# sanity_check_messages(messages) -> check if messages alternate role=user and role=assistant (it's ok if role=system messages are interspersed) ai!
 
 def send_completion(
     model_name,