diff --git a/swh/indexer/metadata.py b/swh/indexer/metadata.py
--- a/swh/indexer/metadata.py
+++ b/swh/indexer/metadata.py
@@ -268,6 +268,10 @@
 
 
 class OriginMetadataIndexer(OriginIndexer):
+    ADDITIONAL_CONFIG = {
+        'tools': ('dict', {})
+    }
+
     def filter(self, ids):
         return ids
 
diff --git a/swh/indexer/storage/__init__.py b/swh/indexer/storage/__init__.py
--- a/swh/indexer/storage/__init__.py
+++ b/swh/indexer/storage/__init__.py
@@ -603,6 +603,7 @@
 
                 - **id**: sha1_git of revision
                 - **translated_metadata**: arbitrary dict
+                - **indexer_configuration_id**: tool used to compute metadata
 
             conflict_update: Flag to determine if we want to overwrite (true)
               or skip duplicates (false, the default)
@@ -649,6 +650,7 @@
                 - **from_revision**: sha1 id of the revision used to generate
                   these metadata.
                 - **metadata**: arbitrary dict
+                - **indexer_configuration_id**: tool used to compute metadata
 
             conflict_update: Flag to determine if we want to overwrite (true)
               or skip duplicates (false, the default)