add release notes for microsoft/vscode#42851

release-notes/v1_24.md

@@ -201,6 +201,10 @@ This release ships an [outline view](#outline-view). Currently, there is logic i
 
 And as always, feel free to join the discussion and to propose API for this: [#34968](#https://github.com/Microsoft/vscode/issues/34968).
 
+### Default argument for keybinding command invocation has changed
+
+It used to be that commands invoked from a keybinding which did not specify any argument list [would receive an empty object `{}` as the only argument](https://github.com/Microsoft/vscode/issues/42851), when invoked. In the upcoming release, that argument will be `null` instead.
+
 ## Preview Features
 
 Preview features are not ready for release but are functional enough to use. We welcome your early feedback while they are under development.