Update README.md

angular · Apr 6, 2016 · 9127440 · 9127440
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 | Name |  Description |
 | --- | --- |
-| `announce(message: string)` | This announces a text message to the screenreader |
+| `announce(message, politeness)` | This announces a text message to the supported screenreaders. <br><br>The politeness parameter sets the `aria-live` attribute on the announcer element |
 
 ### Examples
 The service can be injected in a component.