diff --git a/manifest.json b/manifest.json
index 13c157d..676e4df 100644
--- a/manifest.json
+++ b/manifest.json
@@ -72,6 +72,7 @@
 		"27-10",
 		"27-11",
 		"28-title",
+		"28-reference",
 		"28-01",
 		"28-02",
 		"28-03",