diff --git a/lib/crypto/index.js b/lib/crypto/index.js
index 1e2d5389..1112ed0f 100644
--- a/lib/crypto/index.js
+++ b/lib/crypto/index.js
@@ -40,6 +40,7 @@ exports.sha1 = digest.sha1;
 exports.sha256 = digest.sha256;
 exports.hash160 = digest.hash160;
 exports.hash256 = digest.hash256;
+exports.root256 = digest.root256;
 exports.hmac = digest.hmac;
 
 exports.encipher = aes.encipher;