diff --git a/packages/mermaid/src/schemas/config.schema.yaml b/packages/mermaid/src/schemas/config.schema.yaml
index a7b3549eb..5af146360 100644
--- a/packages/mermaid/src/schemas/config.schema.yaml
+++ b/packages/mermaid/src/schemas/config.schema.yaml
@@ -1428,6 +1428,9 @@ $defs: # JSON Schema definition (maybe we should move these to a separate file)
       htmlLabels:
         type: boolean
         default: false
+      hideEmptyMembersBox:
+        type: boolean
+        default: false
 
   JourneyDiagramConfig:
     title: Journey Diagram Config