diff --git a/aleph_message/models/__init__.py b/aleph_message/models/__init__.py
index 8afec37..045a8f2 100644
--- a/aleph_message/models/__init__.py
+++ b/aleph_message/models/__init__.py
@@ -155,6 +155,7 @@ class StoreContent(BaseContent):
     size: Optional[int] = None  # Generated by the node on storage
     content_type: Optional[str] = None  # Generated by the node on storage
     ref: Optional[str] = None
+    metadata: Optional[Dict[str, Any]] = Field(description="Metadata of the VM")
 
     class Config:
         extra = Extra.allow