diff --git a/features/api/Attr/api.Attr.prefix.html b/features/api/Attr/api.Attr.prefix.html
index 81e3b8b65..339a0b2d0 100644
--- a/features/api/Attr/api.Attr.prefix.html
+++ b/features/api/Attr/api.Attr.prefix.html
@@ -1,4 +1,4 @@
 ---
 id: api.Attr.prefix
-support: unknown
+support: expected
 ---