README: Clarify @glimmer/component situation

README.md

@@ -81,6 +81,9 @@ Inside the `Spinner` component template the `data-test-spinner` attribute will
 be applied to the element that has `...attributes` on it, or on the component
 wrapper `div` element if you don't use `tagName = ''`.
 
+
+### Usage with Curly Components
+
 If you still use the old curly invocation syntax for components you can pass
 `data-test-*` arguments to the components and they will automatically be bound
 on the wrapper element too:
@@ -89,8 +92,8 @@ on the wrapper element too:
 {{spinner color="blue" data-test-spinner=true}}
 ```
 
-Please note that this only works for components based on `@ember/component`,
-but not `@glimmer/component`.
+Please note that the automatic argument binding only works for components based
+on `@ember/component`, but not `@glimmer/component`.
 
 
 ### Usage in Ember addons