add note about Region.description

src/Element/Input.elm

@@ -330,6 +330,8 @@ The `onPress` handler will be fired either `onClick` or when the element is focu
             , label = text "My Button"
             }
 
+**Note** If you have an icon button but want it to be accessible, consider adding a [`Region.description`](Element-Region#description), which will describe the button to screen readers.
+
 -}
 button :
     List (Attribute msg)

src/Element/Region.elm

@@ -101,7 +101,11 @@ announce =
     Internal.Describe LivePolite
 
 
-{-| -}
+{-| Adds an `aria-label`, which is used by accessibility software to identity otherwise unlabeled elements.
+
+A common use for this would be to label buttons that only have an icon.
+
+-}
 description : String -> Attribute msg
 description =
     Internal.Describe << Internal.Label