diff --git a/index.json b/index.json
index 7718959..cadfd6e 100644
--- a/index.json
+++ b/index.json
@@ -128,6 +128,7 @@
   "OP_NOP10": 185,
   "OP_CHECKDATASIG": 186,
   "OP_CHECKDATASIGVERIFY": 187,
+  "OP_REVERSEBYTES": 188,
 
   "OP_PUBKEYHASH": 253,
   "OP_PUBKEY": 254,