README.md in wbench-0.2.3 vs README.md in wbench-0.3.0

@@ -8,10 +8,16 @@
 
 ```bash
 $ gem install wbench
 ```
 
+If you're running an older version (1.8) of ruby, you'll need the JSON gem.
+
+```bash
+$ gem install json
+```
+
 You will need to install [Google Chrome](http://www.google.com/chrome) as well as the chromedriver utility.
 You can install chromedriver (on OSX) with homebrew:
 
 ```bash
 brew install chromedriver
@@ -37,10 +43,17 @@
 
 ```bash
 wbench -b firefox https://www.desktoppr.co/
 ```
 
+### Setting the user agent
+You can also pass the `-u/--user-agent` option to change the browsers user agent (This can be useful for mobile testing).
+
+```bash
+wbench -u "Mozilla/5.0 (iPhone; U; ..." https://www.desktoppr.co/
+```
+
 ### Ruby API
 
 You can programatically run the benchmarks. Simply specify the URL and
 optionally the amount of runs.
 
@@ -70,7 +83,14 @@
   "beacon-1.newrelic.com"=>[587, 235, 248],
   "d1ros97qkrwjf5.cloudfront.net"=>[368, 14, 14],
   "ssl.google-analytics.com"=>[497, 14, 14], "www.desktoppr.co"=>[191, 210, 203]}
 ```
 
-## TODO
-- Add ability to [gist](https://gist.github.com/) results
+### Gisting results
+
+You can install the [Github gist gem](https://github.com/defunkt/gist) and pipe in the results of wbench
+
+```
+gem install gist
+
+wbench http://www.google.com.au/ | gist -d "Google homepage"
+```