diff --git a/arkindex_worker/worker/metadata.py b/arkindex_worker/worker/metadata.py
index 95a3daa9319423e8a9f431ff8b1bb1d917e28157..690361c8a134b88fbaa81443ed5a0eca6cfbe9e7 100644
--- a/arkindex_worker/worker/metadata.py
+++ b/arkindex_worker/worker/metadata.py
@@ -12,6 +12,7 @@ class MetaType(Enum):
     Location = "location"
     # Element's original structure reference (intended to be indexed)
     Reference = "reference"
+    Numeric = "numeric"
 
 
 class MetaDataMixin(object):