Added section on Enabling the profiler.

Thanks to @sparksp for pointing it out.

laravel/documentation/profiler.md

 # Profiler
 
 ## Contents
+- [Enabling the Proiler](#enable)
 - [Logging to the Proiler](#logging)
 - [Timers and Benchmarking](#timers)
 
+<a name="enable"></a>
+## Enabling the Profiler
+
+To enable the profiler, you need to edit **application/config/application.php** and switch the profiler option to **true**.
+
+    'profiler' => true,
+
+This will attach the profiler code to **all** responses coming back from your laravel install.
+
+**Note:** As of the time of this writing a common problem with the profiler being enabled is any requests that return JSON will also include the profiler code, and destroy the JSON syntax in the response.
+
 <a name="logging"></a>
 ## Logging
 
@@ -14,7 +26,7 @@ It is possible to use the profiler to the Log viewing portion of the profiler. T
     Profiler::log('info', 'Log some information to the profiler');
 
 <a name="timers"></a>
-## Timers
+## Timers and Benchmarking
 
 Timing and benchmarking your app is simple with the ```tick()``` function on the profiler. It allows you to set various different timers in your app and will show you their performance when your app ends execution.