diff --git a/manifest.json b/manifest.json
index eb3d876..8324d96 100644
--- a/manifest.json
+++ b/manifest.json
@@ -200,6 +200,7 @@
 		"18-14",
 		"18-15",
 		"18-18",
+		"18-21",
 		"18-23",
 		"19-title",
 		"19-01",