From e14ed1d5bc31ae632e593d8d99ab20a519279aa0 Mon Sep 17 00:00:00 2001
From: eschao <esc.chao@gmail.com>
Date: Tue, 12 Dec 2017 23:18:55 +0800
Subject: [PATCH] Update README.md

---
 README.md | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index ce1bbf0..4486178 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 ## Introduction
-**config** is a simple golang library and designed to read configurations from JSON, Yaml files, environment variables and command line. **config** depends on [go-yaml](https://github.com/go-yaml/yaml) to anlayze Yaml file and use built-in JSON library to handle JSON file.
+**config** is a simple golang library and designed to read configurations from JSON, Yaml files, environment variables and command line. **config** depends on [go-yaml](https://github.com/go-yaml/yaml) to anlayze Yaml file and use built-in golang library to handle JSON file.
 
 ## Installation
 1. Install [Yaml](https://github.com/go-yaml/yaml) library first:
@@ -7,9 +7,23 @@
 go get gopkg.in/yaml.v2
 ```
 
-2. Run the below to install:
+2. Install **config** library:
 ```
 go get github.com/eschao/config
 ```
 
 ## Usage
+#### Defines **default** values
+**config** library supports defining a default value for structure members by using **default** keyword in structure tags
+```golang
+  type Database struct {
+    Username string `default:"admin"`
+    Password string `default:"admin"`
+  }
+```
+
+After specified default value in tags, calls ```config.ParseDefault(interface{})``` to set it on structure instance, example codes as the below:
+```golang
+  dbConfig := Database{}
+  config.ParseDefault(&dbConfig)
+```