diff --git a/src/agents/model_settings.py b/src/agents/model_settings.py
index d8f697809..71e66ed84 100644
--- a/src/agents/model_settings.py
+++ b/src/agents/model_settings.py
@@ -107,11 +107,12 @@ class ModelSettings:
 
     store: bool | None = None
     """Whether to store the generated model response for later retrieval.
-    Defaults to True if not provided."""
+    For Responses API: automatically enabled when not specified.
+    For Chat Completions API: disabled when not specified."""
 
     include_usage: bool | None = None
     """Whether to include usage chunk.
-    Defaults to True if not provided."""
+    Only available for Chat Completions API."""
 
     response_include: list[ResponseIncludable] | None = None
     """Additional output data to include in the model response.