diff --git a/arkindex_worker/worker/metadata.py b/arkindex_worker/worker/metadata.py
index 690361c8a134b88fbaa81443ed5a0eca6cfbe9e7..36b3dbe27bc2ad704849f21b4a8a33777d4d73d0 100644
--- a/arkindex_worker/worker/metadata.py
+++ b/arkindex_worker/worker/metadata.py
@@ -13,6 +13,7 @@ class MetaType(Enum):
     # Element's original structure reference (intended to be indexed)
     Reference = "reference"
     Numeric = "numeric"
+    URL = "url"
 
 
 class MetaDataMixin(object):