diff --git a/index.js b/index.js
index 77ac6bd2..9e4d23d3 100644
--- a/index.js
+++ b/index.js
@@ -39,6 +39,7 @@ bsv.BlockHeader = require('./lib/block-header')
 bsv.Constants = require('./lib/constants')
 bsv.Ecdsa = require('./lib/ecdsa')
 bsv.Hash = require('./lib/hash')
+bsv.HashCache = require('./lib/hash-cache')
 bsv.Interp = require('./lib/interp')
 bsv.KeyPair = require('./lib/key-pair')
 bsv.OpCode = require('./lib/op-code')