Add acknouledgements and document changes

Author: mirisuzanne

css-cascade-5/Overview.bs

@@ -1069,6 +1069,8 @@ Cascade Layers</h3>
 	and come first in the source order.
 	</div>
 
+	Issue(w3c/csswg-drafts#5793): Do we need a keyword similar to `revert`, but for cascade layers?
+
 <h4 id="at-layer">
 Layering Styles: the ''@layer'' rule</h4>
 
@@ -1453,6 +1455,11 @@ Additions Since Level 4</h3>
 	The following features have been added since
 	<a href="https://www.w3.org/TR/css-cascade-4/">Level 4</a>:
 
+	* Added [=cascade layers=] to the [=cascade=] sort criteria.
+	* Defined style attributes as a distinct step of the [=cascade=] sort criteria.
+	* Introduced the ''@layer'' rule for defining cascade layers
+	* Introduced the ''@layers'' rule for defining and re-ordering multiple layers
+
 <h3 id="additions-l3">
 Additions Since Level 3</h3>
 
@@ -1484,7 +1491,8 @@ Additions Since Level 2</h3>
 
 <h2 class="no-num" id="acknowledgments">Acknowledgments</h2>
 
-	David Baron, Tantek Çelik, Simon Sapin, and Boris Zbarsky contributed to this specification.
+	David Baron, Tantek Çelik, Florian Rivoal, Simon Sapin, Jen Simmons,
+	and Boris Zbarsky contributed to this specification.
 
 <h2 class=no-num id=priv-sec>
 Privacy and Security Considerations</h2>