diff --git a/manifest.json b/manifest.json
index e6c4711f3..31ed874c1 100644
--- a/manifest.json
+++ b/manifest.json
@@ -362,6 +362,7 @@
 		"21-12",
 		"21-13",
 		"21-14",
+		"21-15",
 		"21-reference",
 		"22-title",
 		"22-01",