diff --git a/markup5ever/local_names.txt b/markup5ever/local_names.txt
index 47c635c8..575db658 100644
--- a/markup5ever/local_names.txt
+++ b/markup5ever/local_names.txt
@@ -94,6 +94,7 @@ aria-valuemax
 aria-valuemin
 aria-valuenow
 article
+as
 ascent
 aside
 async