diff --git a/queries/highlights.scm b/queries/highlights.scm
index c758b516..6c840b48 100644
--- a/queries/highlights.scm
+++ b/queries/highlights.scm
@@ -33,3 +33,7 @@
   "override"
   "satisfies"
 ] @keyword
+
+; Sub-language delimeters
+(glimmer_opening_tag) @tag.builtin
+(glimmer_closing_tag) @tag.builtin