diff --git a/README.md b/README.md
index 2b2684c1..6314d874 100644
--- a/README.md
+++ b/README.md
@@ -149,6 +149,7 @@ The TAI project is a collaborative effort by researchers and students at UC Berk
 - Charles Xu
 - Ashton Lee
 - Arnav Jain
+- Joshua Chen
 
 ## Acknowledgements
 
diff --git a/ai_chatbot_backend/app/core/models/chat_completion.py b/ai_chatbot_backend/app/core/models/chat_completion.py
index 2042028f..ec94e868 100755
--- a/ai_chatbot_backend/app/core/models/chat_completion.py
+++ b/ai_chatbot_backend/app/core/models/chat_completion.py
@@ -148,7 +148,7 @@ class FileCompletionParams(BaseModel):
     Parameters for file-based chat completions.
     """
     course_code: str
-    audio: VoiceMessage
+    audio: VoiceMessage = None
     messages: List[Message]
     stream: bool
     chat_type: str = "file"  # e.g., "general", "file", "practice"