From 9aad09fe14abea44e32a2dabf4768e1eb31527ea Mon Sep 17 00:00:00 2001
From: Alex Flint <alex.flint@gmail.com>
Date: Tue, 5 Jan 2016 14:00:29 -0800
Subject: [PATCH] fix example code

---
 README.md | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 4a11914..f4c8d11 100644
--- a/README.md
+++ b/README.md
@@ -109,17 +109,23 @@ Fetching the following IDs from foo: [1 2 3]
 ```
 
 ### Custom validation
-```
+```go
 var args struct {
 	Foo string
 	Bar string
 }
 p := arg.MustParse(&args)
 if args.Foo == "" && args.Bar == "" {
-	p.Fail("you must provide one of --foo and --bar)
+	p.Fail("you must provide one of --foo and --bar")
 }
 ```
 
+```shell
+./example
+usage: samples [--foo FOO] [--bar BAR]
+error: you must provide one of --foo and --bar
+```
+
 ### Installation
 
 ```shell