README.md mentions the new default separators.

- new default separator for slide attributes
- new default separator for element attributes
Illustrate both, in html comments.

README.md

@@ -60,25 +60,25 @@ You can write your content as a separate file and have reveal.js load it at runt
 
 #### Element Attributes
 
-Special syntax is available for adding attributes to Markdown elements. This is useful for fragments, amongst other things.
+Special syntax (in html comment) is available for adding attributes to Markdown elements. This is useful for fragments, amongst other things.
 
 ```html
 <section data-markdown>
 	<script type="text/template">
-		- Item 1 {.class="fragment" data-fragment-index="2"}
-		- Item 2 {.class="fragment" data-fragment-index="1"}
+		- Item 1 <!-- .element: class="fragment" data-fragment-index="2" -->
+		- Item 2 <!-- .element: class="fragment" data-fragment-index="1" -->
 	</script>
 </section>
 ```
 
 #### Slide Attributes
 
-Special syntax is available for adding attributes to the slide `<section>` elements generated by your Markdown.
+Special syntax (in html comment) is available for adding attributes to the slide `<section>` elements generated by your Markdown.
 
 ```html
 <section data-markdown>
 	<script type="text/template">
-	<!-- slide-attributes: data-background="#ff0000" -->
+	<!-- slide: data-background="#ff0000" -->
 		Mardown content
 	</script>
 </section>