diff --git a/llm/models.py b/llm/models.py
index f0f79eb6..838e25b1 100644
--- a/llm/models.py
+++ b/llm/models.py
@@ -160,7 +160,7 @@ def __init__(
         self._done = False
         self.response_json = None
         self.conversation = conversation
-        self.attachments = []
+        self.attachments: List[Attachment] = []
 
     def __iter__(self) -> Iterator[str]:
         self._start = time.monotonic()