diff --git a/README.md b/README.md
index 6b264bc..d95b018 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,8 @@ This proposal seeks to enable local web applications to convey a user's intended
* `await window.setResizable(bool)` sets whether the window is user-resizable
* `resizable` CSS media feature yields whether the window is user-resizable
+Windows that are not user-resizable prevent resizing by the user via keyboard shortcuts, mouse drag resize handles, window frame controls, and menus. Such windows do still allow resizing by Web APIs (e.g., `window.resizeTo()`, `window.maximize()`, and `element.requestFullscreen()`).
+
Use cases explored here also rely upon a [parallel effort to standardize](https://github.com/w3c/csswg-drafts/issues/7017) the existing CSS property `-webkit-app-region/app-region`.
diff --git a/index.html b/index.html
index b817fc8..5ba4637 100644
--- a/index.html
+++ b/index.html
@@ -3,12 +3,12 @@
The Additional Windowing Controls API
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