README.md in zan_tools-0.1.1 vs README.md in zan_tools-0.1.2

@@ -16,11 +16,20 @@
 Or install it yourself as:
 
     $ gem install zan_tools
 
 ## Usage
-
-TODO: Write usage instructions here
+```
+$ zan_tools -h
+Usage zan_tools COMMAND [options]
+COMMAND
+   g/generate: 根据指定模板生成代码
+generate options
+    -n, --name NAME                  表名或者类名
+    -f, --fields FIELDS              字段列表，格式：字段1:类型2,字段2:类型2
+    -t, --template TEMPLATE          模板文件
+    -o, --output FILE                输出到指定文件
+```
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.