diff --git a/event.go b/event.go
index 1de87a7..a327800 100644
--- a/event.go
+++ b/event.go
@@ -48,6 +48,7 @@ const (
 	KindSimpleGroupRemovePermission int = 9004
 	KindSimpleGroupDeleteEvent      int = 9005
 	KindSimpleGroupEditGroupStatus  int = 9006
+	KindSimpleGroupJoinRequest      int = 9021
 	KindZapRequest                  int = 9734
 	KindZap                         int = 9735
 	KindMuteList                    int = 10000
diff --git a/nip29/nip29.go b/nip29/nip29.go
index 1904c3b..5d39580 100644
--- a/nip29/nip29.go
+++ b/nip29/nip29.go
@@ -40,6 +40,8 @@ var MetadataEventKinds = KindRange{
 	nostr.KindSimpleGroupMembers,
 }
 
+const JoinRequestKind = nostr.KindSimpleGroupJoinRequest
+
 func (kr KindRange) Includes(kind int) bool {
 	_, ok := slices.BinarySearch(kr, kind)
 	return ok