diff --git a/manifest.json b/manifest.json
index a37ad507..82eeffd5 100644
--- a/manifest.json
+++ b/manifest.json
@@ -341,6 +341,7 @@
 		"21-09",
 		"21-10",
 		"21-11",
+		"21-12",
 		"22-title",
 		"31-reference"
 	]