diff --git a/manifest.json b/manifest.json
index 86bc50d0..a688e40c 100644
--- a/manifest.json
+++ b/manifest.json
@@ -318,6 +318,7 @@
 		"20-01",
 		"20-02",
 		"20-03",
+		"20-04",
 		"21-title",
 		"22-title",
 		"31-reference"