diff --git a/src/key-formats/xpub.js b/src/key-formats/xpub.js
index 20bb157..ed38d01 100644
--- a/src/key-formats/xpub.js
+++ b/src/key-formats/xpub.js
@@ -3,6 +3,7 @@ const bitcoin = require('bitcoinjs-lib');
 const generateXpubKey = ({attempts, xpub}) => {
 	const index = attempts - 1;
 
+	// TODO: Cache the derived node for quick perf gain
 	const node = bitcoin.bip32.fromBase58(xpub);
 	const {publicKey} = node.derive(index);