README.md in arli-0.2.1 vs README.md in arli-0.2.2

@@ -4,11 +4,11 @@
 
 Arli is a simple and easy to use installer of dependencies that can be 
 declared in a JSON file of the following format:
 
 
-```json
+```js
 {
   "dependencies": [
     {
       "name": "DS1307RTC",
       "git": "https://github.com/PaulStoffregen/DS1307RTC.git"
@@ -41,41 +41,64 @@
 
 ## Usage
 
 Run `arli --help` for more information:
 
-```
+```bash
 Usage:
     arli [options] [command [options]]
 
-    -L, --lib-home HOME              Specify a local directory where libraries are installed
-    -h, --help                       prints this help
+    -h, --help             prints this help
 
-  Available Commands:
+Available Commands:
     install      : installs libraries defined in the JSON file
     update       : updates libraries defined in the JSON file
     library      : Install, update, or remove a single library
 
 See arli <command> --help for more information on a specific command.
 ```
 
 #### Install Command
 
-`install` is currently the only implemented command, and it should be used as follows:
+Use this command to install libraries for the first time. 
 
-```
+NOTE: you are allowed to pass `-u` flag to automatically fallback
+to updating any existing folders. So `arli install -u` will either install 
+or update all dependencies.
+
+```bash
 Description:
     installs libraries defined in the JSON file
 
 Usage:
     arli install [options]
 
 Command Options
-    -L, --lib-home HOME              Specify a local directory where libraries are installed
-    -a, --arli-json FILE             JSON file with dependencies (defaults to arli.json)
-    -h, --help                       prints this help
+    -l, --lib-home HOME    Local folder where libraries are installed
+                           Default: ~/Documents/Arduino/Libraries
+    -j, --json FILE        JSON file with dependencies (defaults to arli.json)
+    -u, --update-existing  Update a library that already exists
+    -h, --help             prints this help
+
 ```
 
+#### Update Command
+
+To upate previously checked out libraries, use the `update` command:
+
+```
+Description:
+    updates libraries defined in the JSON file
+
+Usage:
+    arli update [options]
+
+Command Options
+    -l, --lib-home HOME    Local folder where libraries are installed
+                           Default: ~/Documents/Arduino/Libraries
+    -j, --json FILE        JSON file with dependencies (defaults to arli.json)
+    -h, --help             prints this help
+```
 
 ## 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.