diff --git a/css-backgrounds-4/Overview.bs b/css-backgrounds-4/Overview.bs
index c6f152b04423..d112437f361a 100644
--- a/css-backgrounds-4/Overview.bs
+++ b/css-backgrounds-4/Overview.bs
@@ -943,9 +943,17 @@ Background Positioning Shorthand: the 'background-position' shorthand property</
 	<pre class=prod>
 		<<bg-position>> =  <<position>> | <<position-three>>
 		<dfn><<position-three>></dfn> = [
-		  [ left | center | right ] && [ [ top | bottom ] <<length-percentage>> ]
+			[ left | center | right | x-start | x-end ] &&
+			[ [ top | bottom | y-start | y-end ] <<length-percentage>> ]
 		|
-		  [ [ left | right ] <<length-percentage>> ] && [ top | center | bottom ]
+			[ [ left | right | x-start | x-end ] <<length-percentage>> ] &&
+			[ top | center | bottom | y-start | y-end ]
+		|
+			[ inline-start | center | inline-end ] &&
+			[ [ block-start | block-end ] <<length-percentage>> ]
+		|
+			[ [ inline-start | inline-end ] <<length-percentage>> ] &&
+			[ block-start | center | block-end ]
 		]
 	</pre>