diff --git a/servers/fastapi/utils/get_dynamic_models.py b/servers/fastapi/utils/get_dynamic_models.py
index 1aa8b26a..9d49c497 100644
--- a/servers/fastapi/utils/get_dynamic_models.py
+++ b/servers/fastapi/utils/get_dynamic_models.py
@@ -22,8 +22,8 @@ def get_presentation_outline_model_with_n_slides(n_slides: int):
             min_length=10,
             max_length=50,
         )
-        notes: List[str] = Field(
-            default=[],
+        notes: Optional[List[str]] = Field(
+            default=None,
             description="Important notes for the presentation styling and formatting",
             min_length=0,
             max_length=10,