diff --git a/css-color-6/Overview.bs b/css-color-6/Overview.bs
index dda3ef7812f..eb7b3b24d92 100644
--- a/css-color-6/Overview.bs
+++ b/css-color-6/Overview.bs
@@ -86,14 +86,20 @@ Computing a Contrasting Color: the ''contrast-color()'' function {#colorcontrast
or as a background against a list of [=color candidate|candidate=] text colors.
(The effective contrast of a pair of colors depends on their usage.)
- ISSUE (#7359): The keywords to specify whether the [=base color=] is a foreground or background are TBD.
+ ISSUE(#7359): The keywords to specify whether the [=base color=] is a foreground or background are TBD.
- The <> argument specifies the contrast algorithm to use.
+ The <> argument specifies the contrast algorithm(s) to use.
If no [=color candidates=] have been provided,
<> may be omitted,
in which case a UA-chosen algorithm is used.
+
Arguments to a <> [=functional notation=]
indicate the target contrast level.
+ Multiple contrast algorithms with [=target contrast levels=] may be specified,
+ in which case all their requirements are simultaneously applied.
+ A ''contrast-color()'' function specifying multiple algorithms
+ must specify a [=target contrast level=] for each algorithm,
+ and is otherwise [=invalid=].
If the [=target contrast level=] is omitted,
the color candidate with the greatest contrast is returned.
@@ -120,9 +126,13 @@ If there is a target contrast
Candidate colors are tested sequentially,
starting with the first color in the list,
and ending with an automatically appended ''white, black''.
- The first color to pass the specified level of contrast
+ The first color to pass the specified level(s) of contrast
against the [=base color=] wins.
+ If no candidate color passes, then whichever of ''white'' or ''black'' has the highest contrast
+ according to the first specified algorithm wins.
+ If they both have the same contrast, ''white'' wins.
+