diff --git a/CIP-0010/registry.json b/CIP-0010/registry.json
index 33ca40c2e..7deb4b0ef 100644
--- a/CIP-0010/registry.json
+++ b/CIP-0010/registry.json
@@ -7,6 +7,10 @@
     "transaction_metadatum_label": 88,
     "description": "milkomeda.com - the destination address in the sidechain"
   },
+  {
+    "transaction_metadatum_label": 309,
+    "description": "Proof of Existence record"
+  },
   {
     "transaction_metadatum_label": 674,
     "description": "CIP-0020 - Transaction message/comment metadata"