diff --git a/index.json b/index.json
index 486c59d..9e42fba 100644
--- a/index.json
+++ b/index.json
@@ -409,6 +409,7 @@
   },
   {
     "slug": "d556",
+    "type": "implementation",
     "authors": "Steve Bate <svc-fep@stevebate.net>",
     "status": "DRAFT",
     "dateReceived": "2024-01-20",