diff --git a/docs/dev/db-schema.plantuml b/docs/dev/db-schema.plantuml
index 06047ca63..b9c90693e 100644
--- a/docs/dev/db-schema.plantuml
+++ b/docs/dev/db-schema.plantuml
@@ -125,7 +125,7 @@ Note "1" - "0..*" User : owner
 Note "1" - "0..*" NoteUserPermission
 NoteUserPermission "1" - "1" User
 Note "1" - "0..*" NoteGroupPermission
-NoteGroupPermission "1" - "1" Group
+NoteGroupPermission "0..*" - "1" Group
 Identity "1..*" - "1" User
 authToken "1..*" - "1" User
 seesion "1..*" - "1" User