From bcb91433af2d8532dc44d9846fcfaa9125622433 Mon Sep 17 00:00:00 2001
From: you21979 <you2197901@gmail.com>
Date: Wed, 25 Jan 2017 14:26:13 +0900
Subject: [PATCH] fix

---
 README.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/README.md b/README.md
index 7e8e205..5db9798 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,13 @@ npm i bitcoin-util-fee
 
 ## simple transaction-fee calculate usage
 
+please install [bitcoinfees-21co](https://www.npmjs.com/package/bitcoinfees-21co)
+
+```
+npm i bitcoinfees-21co
+```
+
+
 ### P2PKH
 
 ```