diff --git a/css-properties-values-api/Overview.bs b/css-properties-values-api/Overview.bs
index 9ffd7c29..6ded25b7 100644
--- a/css-properties-values-api/Overview.bs
+++ b/css-properties-values-api/Overview.bs
@@ -584,13 +584,6 @@ A custom property registration from {{registerProperty()|CSS.registerProperty()}
 further wins over any ''@property'' rules
 for the same <<custom-property-name>>.
 
-A ''@property'' is invalid if it occurs in a stylesheet inside of a [=shadow tree=],
-and must be ignored.
-
-Issue(939): This will likely change in the future,
-as the behavior of concept-defining at-rules in shadow trees
-becomes more consistently defined.
-
 The '@property/syntax' Descriptor {#the-syntax-descriptor}
 ------------------------------------------------