diff --git a/_data/chains/eip155-10.json b/_data/chains/eip155-10.json
index 06a11075..589532aa 100644
--- a/_data/chains/eip155-10.json
+++ b/_data/chains/eip155-10.json
@@ -16,6 +16,6 @@
   "explorers": [{
     "name": "etherscan",
     "url": "https://optimistic.etherscan.io",
-    "standard": "none"
+    "standard": "EIP3091"
   }]
 }