diff --git a/tests/test_llm.py b/tests/test_llm.py
index ce6f5c4..de902c2 100644
--- a/tests/test_llm.py
+++ b/tests/test_llm.py
@@ -458,7 +458,7 @@ OpenAI Chat: gpt-4o (aliases: 4o)
     json_object: boolean
       Output a valid JSON object {...}. Prompt must mention JSON.
   Attachment types:
-    image/gif, image/jpeg, image/png, image/webp
+    application/pdf, image/gif, image/jpeg, image/png, image/webp
 """