From 5c2b57987f76dcbcc7e09ecd60532f4a7871f565 Mon Sep 17 00:00:00 2001
From: Luke Childs <lukechilds123@gmail.com>
Date: Wed, 21 Feb 2018 13:38:30 +0700
Subject: [PATCH] Document CHECKOUT build arg

---
 README.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/README.md b/README.md
index 257f5b2..8065686 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,16 @@ Checkout this repo and run:
 docker build -t barterdex-api .
 ```
 
+You can also specify a custom branch/commit to build via a build arg:
+
+```shell
+# Build at tip of master
+docker build -t barterdex-api --build-arg CHECKOUT=master .
+
+# Build at commit 715b02e
+docker build -t barterdex-api --build-arg CHECKOUT=715b02e .
+```
+
 ## License
 
 MIT © Luke Childs