From 4b2a6c7bb7b06fdc3f526bc32e4a031188f70b81 Mon Sep 17 00:00:00 2001
From: Luke Childs <lukechilds123@gmail.com>
Date: Thu, 12 Dec 2019 12:50:44 +0700
Subject: [PATCH] Document ARCH build arg

---
 README.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/README.md b/README.md
index ad36092..6b5419a 100644
--- a/README.md
+++ b/README.md
@@ -83,6 +83,14 @@ You can build a specific version by passing in the `VERSION` build arg:
 docker build --build-arg VERSION=0.18.1 -t lukechilds/bitcoind:v0.18.1 .
 ```
 
+You can build a specific architecture by passing in the `ARCH` build arg:
+
+```
+docker build --build-arg ARCH=amd64 -t lukechilds/bitcoind:v0.18.1 .
+```
+
+For a full list of supported build arg options, check out the [build script matrix](https://github.com/lukechilds/docker-bitcoind/blob/master/.github/workflows/build.yml).
+
 ## License
 
 MIT © Luke Childs